The problem is in how people use it. If I say it's a slippery slope from A to B, what that's supposed to mean is that A being true will increase the risk of B

The problem is in how people use it. If I say it's a slippery slope from A to B, what that's supposed to mean is that A being true will increase the risk of B becoming true if other things happen as well. How it's often used though is that if A is a slippery slope to B then A is equivalent to B, and thus any issue with B is an unavoidable issue for A. And of course it gets worse when people jump from A to Z.