I only read the statement and a few follow up posts, but I wonder if this has to do with this recent video or stream where he's showing off the new Photos.app and accidentally showed an unfortunate personal image on his phone/camera roll.
Even if it was a mistake made, caught and never put in the show Leo still has a problem. The live feed gives the trolls ammunition to capture mistakes, amplify them, make sure they are in the worst light and here we are discussing it.
So I can see why this was the straw that broke the camels back .. and now we loose what was a great source of entertainment and community.
I stand by "this is why we can't have nice things."
But even then you still make a great point and he likely just had enough of it too. That being said, when you get into live streaming you sort of expose yourself to things as a public figure and have to be ready for some of it to come back.
Edit: Googled it, was a dick pic shown live on stream from his phone. Story developing under hashtag: #dickgate.
I mean, kids watch his shows. Really inappropriate and there is no way that was "photoshopped" as per his excuses about it.