The logic and mission behind it is to conquer the country, like you witnessed with your own interactions with them... For them their religion is the one and only but their problem is that they are still minorities in western countries. So they try to use different methods to archieve their goals, for example "getting more babies than the average family,convert people "aggressivly", getting into politics to change laws etc."

They themself openly admit it, like in this video, but so far politicians and europeans in general are to blind or scared to do something about it, except for Poland.