So does Twitter, Facebook, Instagram, and every large platform. There is so much harassment, doxing, and other disturbing behavior on all the platforms.
Sure, it may be posted, but lots of it is removed as soon as it is identified and/or reported.
Policies don't mean anything when a huge amount of it stays up and the platform does nothing about it.
There are posts literally and explicitly calling for people to murder others on Twitter. The posts have been there for multiple years (at least the last time I checked). Twitter and the other big players completely fail at content moderation.
wink wink
Also, due to the sheer size, Twitter and the others almost certainly have significantly more of these types of posts.