Are they talking about kicking him off Rick and Morty? I don't watch that show, so I don't know what's going on with it. Just read about the old baby rape video on twitter, can't say it surprises me that he made it.
Yeah, I'm not surprised either. But I also don't think it's a big deal. He was obviously just trying to be edgy and provocative, which is kinda silly but not criminal or anything. By contrast Roseanne's tweet just feels racist, not edgy. I think it's probably the same with James Gunn (trying to be edgy), but his tweets were repeated a bit too often and it got kinda creepy. Still, I don't get why this new trend of digging up ancient tweets is a thing.
The difference, imo, is that James Gunn made those comments a long time ago, already apologized, already stopped making those kinds of jokes. Seems like he grew up, and decided not to try to be edgy in that way anymore. Rosanne (who I still like) was making these crazy ass comments every day. She has actual real mental problems, and I feel a bit sorry for her, but that doesn't excuse her comparing a black person to an ape. Anyone who has grown up in the US knows that has a history here. It probably does in other countries as well, but there is no excuse to not know about it in the US.
I think the Dan Harmon thing is like revenge for James Gunn (just speculation, I'm not reading stuff about it). I don't know how long ago he made the video, and I haven't even seen it, but he didn't put it back on the internet, someone else did. Dan Harmon is a weirdo, but a genius with comedy. He has a hard time getting along with people.