All I know is none of this is easy. One day there will be no need anymore to warn others about anything. The new will have come and the old passed away with all it's groanings, and everyone who remains in Christ will know all truth forever, as we walk with Him and each other.
As I was reading your post, I was reminded of this song that I heard many years ago right at the time I was losing my best friend as she fell away with the lies of the world. It was a super hard time for me, so this song came at a perfect time, helping me to give the situation over to the Lord and just pray for her instead of holding onto all the hurt. I am sure you have done lots of praying for LITS.