Plainly to you, but not to me. What isn't obvious to everyone, isn't really obvious. You didn't care to explain what kind of stopping mechanisms are there, that make it not a slippery slope.

Rowan Atkinson gives some nice examples here:

https://www.youtube.com/watch?v=xUezfuy8Qpc

I'd say rather than there being *a risk* of descending too low on that slippery slope, we already have plenty of evidence this already happened. I'm from Poland and recently a party in ruling coalition proposed criminalizing hate speech on the Internet. Fortunately, precisely the slippery slope rhetoric, supported by evidence from countries like UK, seems to be enough of a backlash to stop politicians from following such ideas.