Probably because your trying to be a smart arse when you cant reply with a constructive post and your opinion falls flat on its face.
This forum and its members most likely expect everyone to speak\post in English, not in some foreign language which shows you have nothing constructive to say and are trying to be clever.
Some people on here have pointed out some of the atrocities thats going on in Europe by some of these people and people like you are in denial.
What is your opinion on some of the things that the people are doing, like the open abuse of other countries burial grounds, the rapes that are and have taken place, the fighting and rioting if they don't get what they want?
I will post this link again, open abuse of a grave yard at the start, skip to 59 seconds and listen to the poor chemical engineer from Iran wishing he had brought warmer clothes because it is cold, really, well go back then! Also why on a lot of these videos do some of the young fit men seem to want to hide their faces? approx 1 min 56 seconds into the video.
http://www.bbc.co.uk/news/world-europe-34370447