That's why free speech basically can't be selective. If it was Reddit banning /r/the_donald, all of you complaining now would cheer the development.
The problem was always that they hid behind the guise that they were the unofficial Donald Trump fanclub when there really never was an alternative one with a more moderate userbase. The_Donald is fine to exist but they seemingly refuse to stay in their playpen and ahve their fun, they need to sling mud throughout the rest of reddit while they're there.
And just to state it, I don't think TD is the only sub guilty of this behavior. I don't think its even an issue exclusive to politics but I really wish Reddit took a more hard look at their rule enforcement to make things clear and had clear transparency for their enforcement of the rules.
Reddit is not interested in being a neutral platform, and the constant scapegoating of the people they drive into containment subs as being the cause rather than the result is both tiresome and idiotic. If you don't want people to isolate themselves and radicalize, don't drive them away from mainstream channels.
One if my main gripes with the current American left is their inability to see themselves as agents who cause the things they hate.
Haven't been there in a while, but an invariant of scrolling through SRS was that the linked posts had a high upvote count, before and after being linked from SRS page.
Which is the entire point of SRS - to show what kinds of things that that group finds objectionable gets upvoted on reddit.
I know that SRS is reddit's favorite bogeyman, but personally, I just haven't seen any evidence to the claim you made.
Note, I am not saying this to argue with you. I am writing this to provide a piece of anecdata to the person scrolling through this thread not much aware of the things being talked about.