There's a whole world of language between "probably would" and "should"
Police arrest man filmed at far-right rally allegedly calling for Keir Starmer to be shot
Video from ‘unite the kingdom’ rally captured man saying ‘someone needs to shoot Keir Starmer’www.theguardian.com
The way our free speech laws work* is that it's absolutely fine to know and to say that the world would be a better place without people in it. It's not OK to suggest that someone should do something about it.
*If you can call it that