The problem here is personalized political advertising. This is dangerous. Political advertising should be general so every citizen has the same messaging. So

The problem here is personalized political advertising. This is dangerous. Political advertising should be general so every citizen has the same messaging. So rather than look for bad actors a cleaner solution is to disable personalized political ads, but that will affect revenue. There is no way you can ban or even demonize activism and dissent without back-pedalling on nearly every democratic ideal. It's not a matter of slippery slopes, its bad actors manufacturing crisis to demonize dissent.