Edit: the Chapo one is out of quarantine. Apparently there were a bunch of posts soliciting violence towards slaveholders and once the mods removed them they lifted the quarantine.
Slaveholders? What kind of violence?
One could perhaps attribute to the difference to a supposedly neutral framing vs. an explicitly partisan one; but much of the opposition to Trump (including from conservatives) has to do with flaunting democratic norms and other such "meta-politics", rather than policy positions, which I think is certainly fair game for the /r/politics hivemind to have an explicit opinion on.
The problem is /r/politics pretends to be a general politics subreddit, while /r/the_donald is explicitly just for Trump supporters.