That's just how humans are. A lot of the time, you might not realize something until it's too late. You can talk about regretting things that could have been done or should have, but we can't change the past. And even if it were possible, the outcome of the changed past might potentially be worse than the present.

I'd know. I've seen multiple outcomes of a single person's life.

[ He says that rather casually with a shrug of his shoulders. ]

It's fine. A lot's... happened, after all.