The pro-trumps will raise the question: "what are the other-side so afraid of, that they are trying to shut us off?" So instead of calming them down, it'll actually have the opposite effect - the feeling that the other side is much more evil than imaginable.
And the questions for bystanders will be "If the powers-that-be can snuff that side, what guarantees that I/we won't be snuffed?"
If you see the foundations of democracy, 'Freedom-of-speech' is actually a device to ensure no political party can have dictatorial powers over what the public can know. Moreover, democratic societies are actually more resilient due to these 'room-to-wiggle' - the other option will be much more violent 'revolution' experienced by dictator-states at their end.
Anyway, the other side is producing gibberish, then so be it. Just refute them properly inside a shared platform.
The problem is that you're not really addressing the actual issue, which is whether or not I can enter into agreements or not contingent on my own actions.
If I can, then it's fair for the other party of that agreement to exercise that part of the agreement and end our relationship. If I can't, then I'm not allowed agency over my own actions, nor is the other party...
Are you suggesting that groups shouldn't create terms of use that are contingent on how a service is used?
A service can today kick you off without your having ever violated the terms of use they publish.
To answer your question, our society presently restricts several types of businesses from either offering or not offering service to certain groups in various circumstances. This wouldn't really be any more of a stretch than preventing the electric company from denying you service.
But what I hear you saying is that society should not allow people to enter into agreements that would be conditional on what they use that service for, is that right?
If so, I strongly disagree.
I should be allowed to enter into agreements based on how I behave, and I expect people I enter into agreements with to abide by what they claimed they'd do, including if they agreed ahead of time that it was up to me to evaluate their behavior and judge for myself when to stop allowing them access to my service.
To deny me this right would be a violation of the concept of ownership, which I believe is a critical aspect of modern society.
This is a different discussion if you don't think people can own things (which is a fair argument, though I would have disagreements as well).
Having non-mainstream beliefs or opinions isn't illegal, and I don't think people should be losing their accounts and data for things that aren't illegal.
We already take that approach for public utilities; your water can't be shut off because of your political affiliation or membership in some unprotected class like BDSM practitioners.
Perhaps web and infrastructure hosting (app stores and communications systems (ie social media) included) should be approached in a similar fashion.