I think when given the opportunity it is good for those who have the emotional bandwidth/energy to try to talk to people who aren't all the way gone, people who have perhaps started to cross over into negative beliefs but who haven't gone all the way or who are just ignorant of either side but have started to find some negative influences. It can sometimes stop them from going the rest of the way. Once they've fully crossed over though? You're just wasting your time. It isn't that people can't come back from that, they can (though cases of them doing so will be rare). It has to come from them having a genuine desire to change though.
Even with people it can be healthy to talk with, there shouldn't be an expectation that anyone should have to do so. Some people are just worn out. Some people can no longer spare the emotional baggage that can come from those conversations. Some people those negative beliefs hit more personally and they can't put themselves out there, or have to do so far too often, to the point where its exhausting. That's okay. Knowing your own boundaries is healthy.
