ISIS is pretty much a zero threat to the US mainland, talk of blowing up New York is just scaremongering bullshit. No doubt something needs to be done, would have thought Obama could send in special ops to assassinate the leaders of these psychos.
You are wrong. There are hundreds of American citizens among the ISIS fighters, and the NSA don't have information about all of them. Some of them could slip back in to the US, re-organize themselves and can commit serious terrorist attacks there. They may not be able to blow up New York, but these people are surely capable of doing some nasty stuff.
Sure, I've heard there's also quite a few Europeans fighting for ISIS, doesn't necessarily mean they're going to comeback to their home country and declare jihad against us all. It's a lot harder for wannabee terrorists to even enter the US since 911, let alone carry out coordinated attacks. Personally I think the likelihood of another big terrorist attack against the West has been blown completely out of proportion.