The distrust is part of the propaganda. If there are only 2 sides, both sides are wrong. Sometimes there are even more sides. By creating distrust each party tries to be good, by making the other look bad. It gives a black/white view of the world. Usually we only hear one side, so it seems that we are on the good side.

It is successful propaganda when you are pushed towards violence and think that the other group are all enemies.

The interesting things come from friendly and intelligent people that are pushed away by either side. They are usually telling about some real problems that are occurring. With "friendly" I do not mean "political correct".