Bathroom bro,
these people are more concerned about their way of life being affected. Western countries have a high level of freedom and tolerance. When immigrants bring with them ideas and practices which threaten this, of course there is bound to be conflict. After all, as an immigrant, we owe something to our host country. We cannot make use of their kind heartedness to change their lifestyle. WE the immigrants have to adapt not THEM. None of these preachers support violence but want immigration capped or reduce as immigrants have failed to adapt.
Sap bro and Bathroom bro, if your own parents or brother or sister were to become a christian, will you accept this happily?. Till the answer to this question is "YES", you know nothing about freedom. For that matter if you are a Christian and your loved one becomes a hindu/muslim, it should also be a "YES". 
All religion should promote freedom and tolerance.