No Lost Causes
Slippery slope arguments are used in reckless abandon by both left and right. Apparently, the term "slippery slope" was coined by someone in the early nineteenth century. As some wit observed, talking about "slippery slopes" was dangerous. Once someone talks about a slippery slope, soon others will, and before you know it we'all be on slippery slopes. [Jonah Goldberg, The Tyranny of Cliches: How Liberals Cheat in the War of Ideas (New York: Sentinel/Penguin, 2012), p.115.]
Goldberg goes on to warn us of the very real dangers of slippery slopes by reminding us of how many figures of speech in our language are applied to this particular grave danger, such as: the camel got its nose under the tent; the ship sailed; "the horse got out of the barn, and drove the wedge that toppled the first domino, which opened the floodgates, and now all we have left is boiled frog." Heh.
One problem with such arguments is that the similes leave out one small matter: human beings are not camels, ships, horses, or thin-edged wedges.
The U.S. Commission on International Religious Freedom