A proper apology would be meaningful. I don't have strong feelings about whether what he's doing 'offsets' what he's done, but going on the record and apologizing would go a long way to get me off that particular fence.

I'd guess the proposition here is "you can wipe away your past good with evil, but you can't wipe away your past evil with good."

Sounds a bit too "never forgive, and never forget" for me.

A time machine, I would imagine.