*EDIT 2* "i don't wanna know" - I know, short version
How COULD someone "not want to know"?????
Dear Wombat, apologies to you and all others here ahead of time, your question has put me in a mood....EDIT, let me rephrase this, your question caught me at a moment when I was ripe to being in a certain mood (to reply at length)..... so to speak. This is the short version of something I am claiming with confidence to know; version A. I may even post the long version as version B. :)
As the lead in quote states " how can someone not want to know?", I am so confident that I believe I know how that I state for the record - I know how.
I know that you are at least among the relative few who are aware that I am frequently given to posting and detailing about the reguarly occuring and ongoing large collection of many things that I admit " I dunno.... I suspect.... I think... I want..... I hope... but I honestly do_not_know". This post is an exception to this. On my path the past few years, I have learned a few basic ground rules, some basic Dos and Don'ts, in coming to accept what it is that I do know and don't know. Herein I've learned that even though I now regularly admit to knowing very little of significance in the grand scheme of things, on rare occasions that I come to beleive there is a particular something I do know, I've learned it wise to reserve consideration for that great, wide, mysterious "unknown". Ergo, I reserve the right to be wrong even in stating what relative little I beleive I do know. One never knows when new information may come along and bite one in the rear, or nose or the like. Be this as it may, I feel pretty confident in saying this - I know how it is that people are prone to being in the position of not wanting to know as quoted in the lead in post and, conservatively speaking, posted about ... given witness to, regularly, daily, through the experiences of many a people who frequent this and other forums here and abroad across the net and which I regularly observe.
I admit to not knowing much of anything of significance in the grand scheme of things, but this is one exception. There has for many years been a massively large system, so massive, so engrained, so common-place, that it is like the veritable elephant-in-the-living room that most of us fail to even notice. This massive system in place is generally premised on the concept of deception applied broadly upon the masses, in existance through the ages but in recent centuries having evolved and taken on all manner of modern devices - high tech, low tech and other, to the extent that such are as additional capacity that also helps bring to bear in clear, observable terms, the quality of constituting a literal mass commercial industry, the I Don't Want To Know Industry, replete with many merchants AND many many manymore users / customers thereof. This one mega industry itself has been a fountain-source to all manner of off-shoot, inter-related cottage/child / feeder industries springing up here and there.... like so many satellite tumors that spring up into existance at the direction and signalling / concert / bio-orchestration from a parent-tumor. This parent industry and all it's child industries have also been woven into the fabric of numerous other massive conventions and separate industries in their own right - history, conventional-wisodm / opinon, high institutions, and the like; the proverbial onion.
This parent I Don't Wanna Know industry in concert with it's surrounding satellite child/feeder industries, have collectively, in many cases silently, subtly, deceptively, indoctrinated people unawares to them the people, conditioned them, altered them, and turned them into beings who have a wide and growing propensity.... spectrum, for mis-knowledge, which said people have come to believe of themselves, to the extent of admitting openly - they do not want to know certain things. Just to pick out three cottages in particular are Cognitive Dissonance, Reality As Theory and the collective Media / Entertainment / Infotainment, ; newsflash! The latter often involves others nefariously conspiring to make certain things appear to be one way when they truly are another way all togther. This suggests conspiracy, the very word conspiracy which has become quite it's own flourishing, growing cottage industry in these heady days of modern 21st-century man/human, one that endeavors to condition people to regularly know, albeit erroneously, for instance, the notion that conspiracies as such by and large are generally and only a matter of somebody else's wild, paranoid theories. To do otherwise, for people to actually confront certain conspiracies that conspire to hide truths that they presently admit to not wanting to know, and coming to know that some truths often are, unfortunately, the result of other people having conspired to contruct them into whatever their present illusions are, this risks..... flirts with causing collosal shifts and counter-forces against the collective present version of reality as theory . The makers of this industry do not desire this kind of shift, to the extent that their users of said industry have also come to beleive that they and their world will not and cannot survive such shifts, shifts that flirt with causign this system to weaken......perhaps fail or possibly self distruct. This and these I know, literally, from having observed first hand with my own two eyes and ears. This and these I know not by relying only on other people's say so second hand methods. Yes, I have used these as occasional guides, but at the end of this all, this and these I know from having observed first hand with my own eyes, ears and brain.
EDIT: As such, I know why/how people can end up not wanting to know, about fluoride, about any thing / issue of significance. Unfortunately, I cannot take what I know in this respect and cause anyone else to know the exact same. What I can do... and hope, is that I can help guide others in ways of using their own two eyes / ears / brain to learn, first hand, knowledge that is quite similar to what I know in this respect :)