Its hard to gatekeep a streamers chat without breaking the spirit of the streams and the chat. Even with the thread here, Im not a janny for the site I cant ban or remove peoples posts, same thing with the livestreams, Synth has a rule where almost anything goes, that means whenever a janny bans or times someone out they go full retard and in some case tattle to Synth who says "Yeah dont time people out for no reason".
For Synth its a catch 22:
-If he did start banning the Kirche posters and people who started the Kirche meme, or if we go even further back the usual autists in the chat, people are gonna respond negatively and there gonna stop watching or mock and make fun of him either here or elsewhere online. We even see this with brigaders whether there from Troon domains audience or Mauler's back in the day or whoever else, where they show up, piss synth off, get banned then run back and start mocking synth in other streams or discords acting superior "Heh, Synthetic man has a thin skin and banned me for making fun of him."
Or
-Synth doesn't ban the retards in chat and continues to let the meme grow among the normal viewers, the spergs are gonna take the meme seriously and then try to start something either by provoking Synth directly or the content creator they want to have react to him (like we see with Kirche).
Theres not really a ideal middle ground because someone or some group is gonna find a reason to mock him or be upset with him. If jannies had more ability to ban premptively before he sees a message then things might be a bit better but thats normally not the case as far as I know.