Sure, microtargeting is bad and should be illegal, but that is not what the parent is asking about. Microtargeting is a fact, and it is immensely powerful. If you don’t use it for your campaign in 2020 you will loose. So you should understand why well meaning candidates use it.
That said there is still a world of difference using it to spread your agenda, vs. using it to spread false information in order to spread your agenda.
While microtargeting is a fact and not forbidden by national law, we need to understand why people use it and universally condemn it when people use it to spread lies.
Aside from data collection questions, yes. I think it's distasteful, but I think it's inevitable. The same techniques are used by grocery stores to send people coupons. This isn't cutting edge.
I'm sorry, but I think this kind of practice should be banned no matter if it's true, false, political, commercial, non-profit, or whatever.