SRS isn't on r/All 24/7. SRS doesn't fill up 90% of /rising. SRS is only "infamous" for being a deflector for criticism of far right subreddits. No one has heard from that subreddit for years.
There are much more active subreddits that side with SRS if you want to go there, like circlebroke. There are also much more extreme subreddits than the_donald, like TheNewRight. Nobody is talking about banning those subreddits. This isn't a partisan argument. The_Donald is (purposely) interrupting how reddit works. I'm not an American and I have no dog in this fight, but the_donald is ruining reddit for a lot of us.
SRS users are actively undermining and destroying other subreddits, either by infiltrating the mod team and gaining their trust, or abusing reddit's bureaucratic process and having the existing mods removed for inactivity.
This has been happening for years, and the admins are complicit in it. As far as 'ruining reddit' goes, SRS/SRD are among the worst offenders for sure.
They drastically reduced the amount of articles from the same subreddit that can be on /r/all at the same time. The page used to be >90% Trump before the change (and >90% Sanders or >90% Obama during their respective campaigns, but of course the admins never bothered doing anything to stop that)
Ah, but SRS is hate speech for a cause the reddit staff believe in, while other subreddits are hate speech for a cause the reddit staff don't believe in. Huge difference.
SRS is reddit's favourite bogeyman, but it is, and always has been, just a place that pokes fun at the rest of the site.
The admins aren't even on their side (their political leanings are assuredly different); SRS were just never as bad as people claim, and so the admins never had a reason to ban it.