I think I probably would use a project that had a license that said "you can use this for now, but if I later decide I don't want evil people to use it, you'll have to maintain your own fork based on the last version before I made that decision."

Isn't that kind of always the bargain we're making? We can use someone's work as long as they're willing to let us, but if they change the license, we might not be able to continue using it.