The trouble with the slippery slope argument is that it is sometimes true.
There are times when one smaller step leads to a larger step. We can become desensitised to crude language, or casual mockery of the opposite sex. And it then we do these things in increasing measure.
- Because sometimes true, we cannot brush aside the slippery slope argument.
Yet there are times when this argument does not apply. Plenty of people know how to enjoy a beer without falling into drunkenness. We know how to befriend someone without personal compromise, even with profound disagreement regarding God, politics, family life, etc.
- Because sometimes true, we must be wary of applying this argument to every situation.