Remove the phones and the problem will remain, which is people’s desire to consume detrimental content, or content in detrimental amounts.
Before phones/computers/internet, it was garbage on television channels. Propaganda on 24/7 “news” channels, “reality” tv shows, etc.
So it's not propagandists that are the problem, but rather the people they target? That's an odd take.
Maybe we should've shown a little more spine when they asked us to build a medium for the strong would use to prey on the weak. Maybe we're the problem.