I feel my response here [1] also applies to you.
People are going to do these things anyway. We've had "yellow journalism" since the 1800s. It's a tale as old as time.
What right do we have to go around policing other people's minds?
When I grew up, the Internet was an escape from the puritanical censorship of the southern baptists I was surrounded with. It was a bastion of free information and idea exchange. If the prevailing ethos of the 2000s wasn't so anti-censorship, I wouldn't have gotten outside of my own filter bubble and found a way to explore other ideas. I would have been chased away as an undesirable member of the opposition and muted, censored, and banned. Thank god the algorithm didn't exist back then.
The things we do to each other in today's internet are abhorrent. Both sides of the political spectrum attempt to constrain what the other side can do. We need to stop that. It's petty and increases polarization. And that's exactly what's happening with your suggestion - you're wanting to censor ideas and things you don't like that presumably this technology will be used to promote.
Please stop thinking LLMs are an agent of the enemy to convert more people to their causes. The opposite is also true. And the impact won't be as extreme or dire as you make it out to be - heaven forbid people buy more vitamins. Oh, the humanity.
[1] https://news.ycombinator.com/item?id=42499972