I don't put much stock in slippery-slope style arguments. If you're going to make an argument like that, you need to support it with other instances where the same group/government has actually fallen down that slippery slope, to great detriment, in a similar enough situation for it to be likely to happen here.

Without that, it just comes off as hand-wavy anti-government fear-mongering. It's telling that you used the term "authoritarians", as if any law that's passed that can restrict what someone can do is necessarily authoritarian... which, well, as I said, it's telling.

I'm more concerned with the fact that these sorts of laws don't just affect kids: they require adults to supply government-issued identification in order to use these services, which I think is crap.