1. 1% is not super small amount at all.
2. It's more than 1%. Eg, the number of them who will say that a woman should wear burka or whatever is way more. (Now read 3.)
3. They don't assimilate. It's maybe 1% that assimilate, if that. And when they don't assimilate, they start to enforce 2 onto others.
But you know all that and are posting simply because you want to start a fire.