That is because you are incorrectly using the the charge of the Slippery slope fallacy to hand wave away legitimate concerns by reducing them to an absurdity which is itself a logical fallacy

The legitimate concerns here are not a slippery slop, they are real and self evidence born from countless examples through out history of these types of survelence systems being abused. EFF points to a coulple, other artiles point to other examples

It takes a person an extremely dense person (or intellectually dishonest) to simply hand wave all of these concerns away as "well that is just a slippery slope so I can ignore you"