This is true, and probably was not the best way to express this. As such I will edit out the comment.
Yeah, I think that is fair. Digging through the past is more relevant if someone is still behaving a certain way in the present. Or there is credible reason to think they are/haven't learned/will still act out. If it were a topic about sexual assault and high school teachers and Bishop was still shitposting about hot teachers, fair enough.
There's a lot of posters on this forum, some who you might even think are like Jesus walking on water, who, if they were a member of GAF since early on (and they were younger), might have some dumb posts, edgy shit, or failed jokes. Maybe even a few bans or timeouts for overreacting on GAF. It's a bit harder to delete all your GAF presence, versus cleaning up your own personal social media accounts.
The bigger issue with Hart as well is this isn't just evidence from his standup where many comedians try to say they did jokes of the time, or went after everyone for the butt of a joke. He just seems to be calling random people on twitter f*gs and using that word as a way to insult or attack other people.
Many comedians can be very off the cuff and crude in their standup, but people you could introduce to your Grandma off the stage and away from their acting/writing. Not that you cannot criticize the work of these people too, but an attempt at work/artistic merit is obviously different than randomly acting people on Twitter and calling them slurs.