There is a fine line between slippery slope as a fallacy, and the legitimate concern that the very existence of a feature like this invites abuse. Or the even more legitimate desire to build a world in which bad actors (corporations, governments, etc.) cannot do remote evil, rather than a world that works only because they don't do remote evil.

That which does not exist cannot be abused. I'd much prefer a world where authorities cannot disable software, not a world where they merely don't.

That's not fallacious slippery slope reasoning. It's an argument for structural and technical rather than merely moral, ethical, or legal impediments to abuse of authority.