My experience has been the polar opposite: The older I get, the more I've seen people come to completely incorrect conclusions that justify their decisions to harm others. This ranges from petty things like spreading gossip, to committing theft from people they don't like ("they had it coming!") to actual physical violence.

In every case, zoom out a little bit and it becomes obvious how their little self-created bubble distorted their reality until they believed that doing something wrong was actually the right and justified move.

I think you're reaching too far to try to disprove the statement in a general context. Few people are going to say "violence is always the wrong answer" in response to someone defending themselves against another person trying to murder them, for example. I think these edge cases get too much emphasis in the context of the article, though. They're used as a wedge to open up the possibility that violence can be justified some times, which turns into a wordplay game to stretch the situation to justify violence.