All people that are seen as extremists or radical in their behaviour, are in fact people that have a limited amount of information and act upon that with a great deal of determination. They reach conclusions with what they have learned so far about the world around them. And then they act, with the belief and the wish to do good, to help.
This is because as humans we learn to judge things as wrong or right and we want to right a wrong, most of the times.
One solution then is to help others extend their knowledge, see things from new perspectives, reach different conclusions.