Has anyone demonstrated how many people these "Russian bots" have influenced? There's enough craziness online before throwing in non-linear warfare. I'd imagine it's far less influence than, say, Charles Koch has. Why is it ok that he has an outsized influence on our "democracy" but such a terrible thought that Putin has influence? It's not like either person will act in our collective interest.
It's connected to the same reason we only allow US citizens to be involved in US politics. You at least assume that a citizen has a direct interest in the country's domestic well-being. We talk about russian bots nationally because violating that norm is a cultural scandal, but there's plenty of discussion around outsize influence by corporations and the rich in social media as well. It's not really okay for anybody.