Why are they being tolerated? Look, it's all fine and dandy to be hands off and not want to moderate people for their opinions. But is there no sense of patriotic duty to oppose foreign attempts to influence our people through propaganda, to foreign benefit?
I believe that is the duty of the reader to determine whether or not something is 'propaganda'. Information is like anything else you put into your body...buyer beware!
That being said...USMB is not ground zero for the Russians..or anyone else..for that matter. Facebook....Twitter....Instagram....Google...the major efforts are directed at the big platforms. A bunch of grumpy Boomers of either political persuasion--merit minimal effort.