slippery slope fallacy - Google Search

The way a slippery slope argument goes is that if we do something, call it X, then there is a serious risk that it will start a trend, which will lead to other things such as Y and Z, and although X in and of itself is fine, maybe even a good idea, Y and Z are pretty scary. The conclusion is that you shouldn’t do X unless you are willing to accept

Tenbrunsel and Messick identify the proverbial “slippery slope” as another enabler of the kind of self-deception that leads to ethical fading. With each ethical transgression that is tolerated, we pave the road for more and bigger ethical transgressions.