That's actually pretty reasonable. It's been over a decade since my professor told me that and this is the first time I've ever heard a cogent argument for the slippery slope being a less than ideal form of argument.

I am a bit skeptical that the arguments had to be entirely based on supposition, even if they mostly were in the end. Leftists aren't subtle about their end goals, and this site and its Faggit predecessors are full of examples of the mask coming off. If the right wasn't so fucking useless I'm sure they could have dug up examples of the usual suspects saying that refusing to fuck a tranny is transphobic and ideas like that before they entered the mainstream.