This should be troubling because as a collective society we should already be past asking questions of "do I need to treat people nicely even if we disagree on one or two topics" or "why can't we kill babies".
Our world is filled with complicated problems, and if we keep twisting ourselves in knots over something somebody did to us years ago, we'll never be able to properly address them.
People ask, "am I good enough". Dangit, you better be good enough, you're the only you you've got. By default you're the best.
The real question is "how do I get better".
Because any good person can become bad, and any bad person can become worse.