If you insist they give up their culture immediately you will be seen as trying to take away their culture. Just like how gun rights advocates perceive attacks on gun culture.
Solidarity is a normal reaction to real or perceived hostility. In history the social pressure to assimilate resulted in immigrant collectivism in order to support each other; Chinatowns, little Italy and a myriad other ethnic enclaves formed partly because of this pressure.
Well thats just it. If they would use these laws, then I'm okay. But they are not. Justin Trudeau has decided to ignore them. We have people crossing the border from the US every day now. Once they cross, we just set them up. He is rushing the Syrian refugees as well.
You can quote the laws and procedures all day. But my own government has decided its okay to ignore their own laws. They are not even trying to hide it. Its being praised in our news. They are hailing it like some kind of great thing that our government is doing.
My government is ignoring the law. Then they are creating new laws to silence the people who are speaking out against their actions.
And that right there boils it down to why there is a growing number of people getting really pissed off.
EDIT: Plus, you cannot be serious thinking Germany is actually vetting anyone coming into their country right now. They just have their borders open.