In what way did Apple cross a line? Platform vendors have automatically removed malware for many years. In this particular case, Apple, in consultation with the vendor, removed a particularly nasty vulnerability. The software itself was left alone. In fact, because the software was written so poorly, the vendor didn't even have the ability to address the problem - only Apple could. It's even odder to bring up ethics - should Apple have knowingly left zillions of users exposed to this?

To make this look scary, you have to misrepresent what Apple actually did and then extrapolate to some frightening hypothetical to end up at nothing more than a risk inherent in all self-updating software.

If the position is 'all self-updating software is an unreasonable risk', fine. But at least argue that unvarnished, and I imagine to most people, extreme and impractical view instead of trying to dress it up as some novel and intricate argument about morality and creeping authoritarianism.