they failed to integrate in society, that their parents failed to learn our language, which makes them speak Dutch poorly aswell and consequently do bad at school.
Thats the whole problem I have with immigration of large groups from one culture. It allows them to form a community with other people like them, or rather it means they wont feel the need to intergrate and thus wont integrate.
America is a bit different situation as everyone here, including the so-called "natives" is an immigrant.
Some people say that America should be a "tossed salad" with each group retaining its original culture. However, an area that consists of a mixture of completely different cultures isnt going to be stable. To continue the analogy, I think that ones former culture should be like the ingredients used in a soup, with each ingredient giving up a part of itself to the whole and taking the overall favor of the whole into itself.
When tens of thousands of immigrants remain in their enclaves, speaking their own language, following their own religion, and interacting little with anyone not of their own culture, one can see how the surrounding people might be a bit leery of them. A great many have decried Americas policy of educating Indians as a systematic attempt to wipe out their culture but it was mostly done with the intent of integrating them into American culture.
In the last couple of decades, about a tenth of the population of Mexico has come across Americas southern border, mostly illegally. If they dont want to turn the southern states of America into northern Mexico, with all of the problems, perceived or real, that they have fled, then they need to be less Mexican and more American. Education seems to be the key here. Mexican kids that grow up going to American schools, and who dont get involved in Mexican gangs, usually turn out to be normal American kids.
Be aware and proud of your ancestral culture but also be aware of that its not the one in which you are living now. If you refuse to integrate into your new culture you will be seen less as immigrants and more as invaders.