Yet the UK doesnt have private systems such as Flock like the US does.
From my experience it's easy to find plenty similar or even more direct or more hatefull messages or calls to action regarding other places, events or more minor movements. But those come from minorities or involve movements with less momentum or movements abroad.
On the other, I do think that we should put people in prison for posting on facebook. That way I won't have to keep seeing my crazy uncle at family gatherings!
I guarantee you that exactly the same statement made about other groups would not even lead to an investigation.