Foreigners' Assimilation

Søren Espersen, a proud member of parliament for Dansk Folkeparti (Danish People’s Party) and a true clone of Holger Danske, wrote an article in Politiken, Se at blive danskere (in danish). The english translation can be read at Gates of Vienna.
The bottom line: Assimilation shouldn’t really be a shameful word, but something that we can demand of immigrants.
So, a foreigner in Denmark should forget all his/er roots, native language, culture, tradition, everything..., when s/he comes to Denmark. And these, what for?