The Muslim you think might be your nice neighbour is not really your real friend anymore than the guy at the local car dealership is your friend even though he's super friendly if you go look at cars.
That's a hell of an assumption. And a nice neighbour is all I really need my Muslim next door neighbour to be.
It's also strikingly similar to what I've been reading in Laurence Rees new book Holocaust. Many Germans objected to Nazi propaganda by saying that the Jews they knew personally were good people. So the Nazis produced a propaganda campaign (poison mushrooms) that argued that some Jews pretended to be good people but Germans should not be fooled. In fact these Jews who pretended to be good and ordinary Germans were the most dangerous of all because they were hiding what they truly were. Like mushrooms that appeared harmless it was claimed they were really poisonous.
http://www.aish.com/ho/p/Personal-Accounts-During-the-Holocaust.html