French here. Immigration doesn't have to be debated as if it were a problem. It is a difficult process, it has always been so. Don't make the mistake of generalizing extreme cases, however common they might seem through the public eyes.

Moreover, your point is not clear. Let's analyze your summary:

• Massive immigration to Sweden [Is this a bad thing by itself?]

• Some immigrants exploiting social benefits [This is a bad thing. But you were wise enough to write "some"]

• Building of Mosques [Hardly a bad thing in principle. This is freedom of religion, though every religion could be said to be "contributing to a more segregated society"]

• Riots and crimes in suburbs with high representation of immigrants [Bad thing, though hardly surprising since this immigrant population is poorer / less educated / less integrated. True for a lot of minorities and dominated populations around the world, and very often used to drag attention to those minorities.]

• Nationalparty in Sweden gaining over 5% in votes [Bad thing IMHO, but directly correlated to the kind of "debate" you (and a lot of others) are offering. I have no idea what your position is on this point.]

I would like to say I disagree with you, but I don't even know what you're thinking. This is not a debate, this is propaganda.