It is a logical fallacy if used as part of an absolute claim, but it doesn't make it always wrong when used in general statements. Some slopes are slippery, we can look at history to see this. We can't claim all slopes are slippery, this doesn't mean that no slope is slippery.
People aren't starting with axioms and then defining what absolutely will happen. People are discussing trends that appear to happen generally, but there will be exceptions. Going to college leads to a better job is a slippery slope, it doesn't always happen, but going to college is still good advice (and even better advice if one is willing to go into detail about the degree, the costs, the plans at college, and so on).
If we want to reject something as a logical fallacy, we need to consider if the other person's argument hinges on something always happening as some sort of logical proof, or if it hinges on it happening only at or above some threshold. If the first case, pointing out a slippery slope argument is a valid counter, but in the second case, it isn't and instead leads to two people talking past each other (one arguing X happens often enough to be a concern, the other arguing that X doesn't always happen, both statements that could be true).
People aren't starting with axioms and then defining what absolutely will happen. People are discussing trends that appear to happen generally, but there will be exceptions. Going to college leads to a better job is a slippery slope, it doesn't always happen, but going to college is still good advice (and even better advice if one is willing to go into detail about the degree, the costs, the plans at college, and so on).
If we want to reject something as a logical fallacy, we need to consider if the other person's argument hinges on something always happening as some sort of logical proof, or if it hinges on it happening only at or above some threshold. If the first case, pointing out a slippery slope argument is a valid counter, but in the second case, it isn't and instead leads to two people talking past each other (one arguing X happens often enough to be a concern, the other arguing that X doesn't always happen, both statements that could be true).