> I don't want to board an airplane with someone who has a history of assaulting people.

> Do you want a loose cannon who has assaulted people in the past on a tin can with you at 50,000 feet?

If this someone paid whatever price a competent court of law imposed on them, then I have no problem boarding a plane with them. People make mistakes, even grievous ones, and even ones that you or I wouldn't make on our worst of days. The law encodes the penalties for those. Beyond that, what you're advocating for is extrajudicial punishment.

That's a key problem here. People don't agree on what's acceptable and what the proper criteria for forgiveness is.

If somebody did one of your more unambiguous transgressions, like assault (proven to a jury beyond a reasonable doubt, i hope?), but reformed themselves, how do you know and who decided that? Maybe they did it because of a drug habit, mental illness, some other extreme condition that they've now worked past. Maybe they really don't want to do it again, and would not.

These are the types of problems that can arise when you split the world between good and bad people. Not everyone who does something you disapprove of is irredeemable.