Consider it from a different angle - if a techy Q-anon "fixed" the algorithm of someone whose device they had access to due to tech help. That person would rightfully be pissed off, even if the Q-anon tech nerd explained that it was for their own good and that they needed to be aware of this stuff etc.

Obviously that's materially different to the situation at hand, but my point is that telling someone that what you've done is necessary and good will probably only work after it's helped. Initially, they may still be resistant to the violation of trust.

If I think of how I would in that situation, I feel a strong flare of indignant anger that I could see possibly manifesting in a "I don't care about your reasons, you still shouldn't have messed with my stuff" way, and then fermenting into further ignorance. If I don't let the anger rise and instead sit with the discomfort, I find a bunch of shame - still feeling violated by the intervention, but sadly realising it was not just necessary, but actively good that it happened, so I could see sense. There's also some fear from not trusting my own perceptions and beliefs following the slide in reactionary thinking. That's a shitty bunch of feelings and I only think that's the path I'd be on because I'm unfortunately well experienced in being an awful person and doing the work to improve. I can definitely see how some people might instead double down on the anger route.

On a different scale of things, imagine if one of my friend who asked for tech help was hardcore addicted to a game like WoW, to the extent that it was affecting her life and wellbeing. Would it be acceptable for me to uninstall this and somehow block any attempts to reinstall? For me, the answer is no. This feels different to the Q-anon case, but I can't articulate why exactly