The point of SRS is not to change the world, it’s to have a place where you can laugh at idiots and have no one spoil that fun. And that’s perfectly alright.
These two sentences do not go together.
It’s like a tumblr making fun of fundamentalist christian screeds. It’s not intended to convince any fundamentalists that they are wrong, but it’s a place to vent and laugh together with like-minded people.
If "no-one understands" a typical SRS'er, why do they have I-don't-even-know-how-many-now subreddits with healthy numbers?
If it exists solely for the purpose of venting (not a downvote brigade, wink wink, don't touch the poop!) and not for accomplishing anything else, then why do SRS'ers so often seem to be charging into other parts of reddit and getting into such dramatic arguments?
Finally, if you really just want a place to make fun of stupid crap? Try /r/worstof or /r/subredditdrama, both of which actually do that.