Take what you support and imagine it used against you in the worst possible ways. Do you still support it? If yes, then it is worth supporting. If it's not, then maybe you're only supporting it because of who it currently helps or harms. This exercise also works with things that you don't support.
This makes the false assumption that authoritarians won't abuse the system simply because non-authoritarians didn't. Authoritarians gonna make up their own authority regardless.
I think they’ll try to, but not always succeed. They will definitely use and abuse any existing powers.
So I think it’s logically unsound, and quite sad to me, to argue that it’s pointless to resist allowing powers that can be exploited because authoritarians will do it anyway.