I agree with you (i.e., I share your belief that the whole "safety" argument is a bold-faced excuse to just gain more control and surveillance power over the population), but I believe that the parent comment was just trying to be extra charitable to those pushing for the bill.

I think it is fair to give the opponent's position (which both you and I believe is in the wrong) a steel-man argument treatment, by assuming the best possible interpretation of their argument (even if they don't imo deserve it, and you don't believe in their stated intent).

The approach makes sense to me, as attacking and debating genuineness of someone's intentions is an endless rabbithole. So if you have an option to decimate their case, all while assuming their stated intent to be truthful and genuine, that's a pretty solid way to actually move the needle on the argument in a desired direction.

This! Very well explained.