Good points. 
This article and others are quick to mock the "silly" slippery-slope arguments.
Problem is,  through the magic of the internet it's possible to see what's happening elsewhere for ourselves. 
Much has been made of Britain's sharp rise in "hate crime" post-Brexit. 
Like this:
http://blogs.spectator.co.uk/2017/01/watch-andrew-neil-skewers-oxford-professor-hate-crime-claim/

Viewer note: this isn't a Fox News ambush - the interview is on the very Leftish BBC.