Radio is a technology. Facebook is an application of technology. The internet would be a better comparison which arguably has overwhelming positive impact.

Radio and internet have both had positive and negative effects. One can also say they are only neutral platforms, and people have then created positive and negative things with them. Same can be said about Facebook or Reddit too IMO. At what point does the morality start, complex question.

Then surely the same complaint could be made about some particular radio stations.