In my experience a lot of slopes are slippery, and a lot of people who cry "slippery slope" are disingenuous; they know the slope is slippery and they want to s

In my experience a lot of slopes are slippery, and a lot of people who cry "slippery slope" are disingenuous; they know the slope is slippery and they want to slide down. As to why slopes are slippery, it may be that it's easy and natural to build political alliances advocating for either side of it, but hard to build an alliance advocating for the middle.