Why would these groups, which locally easily are a third of the population, if not the majority, want to integrate? German "culture" is literally just doing 8-5 work. Of course they are going to assert their native cultures.
>A mixture is to be expected and is a necessity for human and society evolvement.
A mixture of what? Speaking German + fundamental Islam + LGBT rights + driving a BMW + putting Gyros into bread. Is that "integration"? Completely laughable to be honest. These migrants group are doing what all otuer groups would do, forming their own parallel society, with their own shops, their own spaces and asserting it in the face of integrationist pressure.