There might be more itemized reasons why they attacked France. We know why they did last time, anyone who tries to personify Muhammed deserves to die. But this is ISIS attacking the west. Paris has a large contingency of Muslims, segregated sure, but you can't assimilate people who don't want to be assimilated. They're radicalized and that's that. It's cut and dry and it's complicated. But I think this kind of thing could happen anywhere really. Not just Paris.
Apparently, intel thinks it's not ISIS, it's Al Qaeda trying to get back in the headlines, since ISIS has been stealing their thunder...
Saying you can't assimilate people who don't want to be assimilated, well, that's just a completely dumb thing to say... we assimilate Muslims great and the French don't...
The main danger for us in all this is that we'll have ignorant assholes taking it out on perfectly good American Muslims and turning their kids against their very own home nation... which is what happens in France: people who grow up there end up hating the place because of how they're treated... for the most part, that just doesn't happen here....