There is no such thing as time - or space. So, a "bad" childhood and robbing and murder 30 years later are all happening at the same time. Karma is created in the childhood, and karma is created in the murder/robbery.
Yes, I responded to your earlier question with the response that you have to forgive all karma, and that's still true. You can't logicize your way out of it!
"Jesus and forgiveness have absolutely nothing to do with the topic."
Perhaps Jesus doesn't, but forgiveness does. Jesus brought forgiveness to the planet to end the karma game. The only way off the planet, the only way to escape karma, is to forgive others, and even more importantly, to forgive yourself. Until you begin to understand and identify yourself as spirit, you will be stuck in a body until the end of the earth. Spirit doesn't use logic. Bodies do. You are in an infinite loop, on a body level. You can escape your loop by recognizing yourself as spirit.
True, there is no such thing as "right" or "wrong" - however, there is one rule that we each agreed to abide by when we took a body in this reality and that is - to not invade the space of another person. It is summarized on a body level as The Golden Rule which originates out of many belief systems and religions.
Jesus gave an example of space invasion when he gave the illustration "..if you lust after a woman in your heart, you have committed adultery already." Jesus was a Jewish comedian, an early George Jessel. In this illustration he wasn't giving some ethic or the teaching of a right or a wrong, he was simply saying that whatever you think you are doing, as spirit, you are doing it. If you wish another person dead, you have committed murder. When you "hate your brother" (anyone on the planet), you have committed murder. If you wish ill of another person, you have invaded their space. It's that simple. It's what creates karma.
When asked what the greatest "law" was in the law and the prophets (all the sacred writings of his day) he replied: "To love the lord thy god with all thy heart and soul and to love thy neighbor as thyself, for this is the law and the prophets." Here he reiterated what you have said, that there is no such thing as right or wrong (the law and the prophets is filled with dos and don'ts), but he also stated the law of the planet, to love your neighbor as yourself. And the purveyors of ethics totally ignore the second part of that quote which is - to love yourself. If you don't love yourself, it is impossible to love your neighbor. It is impossible to treat your neighbor with respect because you are not treating yourself with respect.