It's really Evangelical to demand that everyone who leans left be a completely morally pure person.
There's no such thing.
We are only human and we make mistakes because of ignorance, youth, etc. A 20 year old who made racist remarks can indeed grow and change and realize that they were foolish when they made them. To hold their actions from the past when their actions now no longer reflect their past is counterintuitive and denies them the growth they had rightly worked through.
People can grow and change and become better and that needs to be encouraged. Holding their actions from years ago over their head is what Right Wing Evangelicals do.
Humans are messy creatures who can and will make mistakes. Even you.
To add if someone is consistently bad as they were back at 20, then yes, call them out on it.
But if someone made the effort to change, grow and be better, don't hold their mistakes over their head. It doesn't put you on a moral high ground; I'd say it actually puts you around the same level as what the person was back before they changed.
