I personally don't feel under siege. Maybe I'm just thick-skinned and/or apathetic.

There is a lot of anit-Islam/anti-Muslim sentiment, but I'm not surprised given terrorist attacks etc. This does not excuse such attitudes, it's just, given human nature, an unsurprising reaction. As glo said, it's similar to the suspicion of the Irish.

In the States, when Islam is feared, it is feared as if it were the new Red Menace.

Every time has its 'enemy'. That's politics. Most of it is based on ignorance and fear. That sentence applies both to politics and bigots