The problem with that mentality is that you end up with situations like we have in England where immigrant communities end up exiling themselves because they feel it's more beneficial to all involved - they don't have to feel 'alone' in a foreign country and the natives don't have to worry about their precious status-quo being disrupted. If you have unrealistic 'integration' expectations, you'll find that people will resist or buck it completely. This leads to segregated micro-communities when people of certain ethnicities flock to specific areas of the country. Said communities are then left to fester and start harbouring resentment for their host country. Because they've been allowed to segregate themselves so thoroughly, they start to wonder why the countries laws and traditions do not reflect their own, after all, their 'world' now ends at the boundaries of their own community. This leads to severe culture clash. This is why immigration has to be a give and take - please excuse the cliché, but on both sides tolerance is indeed needed. After all, as much as we like to kid ourselves that it isn't true, we need immigrants just as badly as immigrants need us.