Bigotry is not just racism. There's an American bigotry wrapped up in a neat package with a nationalism and patriotism that strongly implies anyone not from this country is inferior and has no right to profess an opinion.
I don't think anyone is blaming Islam when little Johnny Mohammed steals a car, gets caught stealing, gets caught doing/selling drugs, speeding, or any other "common" crime any more than they blame christianity when little Johnny Smith does it.
But, when Johnny Mohammed blows up a bus full of kids, a train station, a highrise building, a mosque, a church, targets civilians with violence or any other zealous crime, Islam then enters the picture. unfortunately you don't hear of Johnny Smith committing these types of crimes and therefore his being Christian isn't as noticeable.
People get the idea "that terrorism, killing innocents, is part of Islam" because that's what they see in the news.
The reason is (1) that it's easy and (2): why should Muslims immediately demonstrate when Osama bin Laden does something wrong? And - even worse - why should we make up the "conclusion" in that case that the Islamic community actually quietly approves with the message send by these terrorists, the underlying message I sense in your post McGentrix? On the other hand: should Americans widely demonstrate on the streets for the atrocities being done by some American soldiers in the Abu Graib prison? That's just nonsense! Why should people "prove" to the rest of the world that they do not approve with the acts of certain members of their religious or national community? Demonstrating against these acts should come out of own disgust and free will to do so, and not out of fear that else the rest of the world will think you quietly approve of the acts of some terrorists.
And believe me, after September 11th I spoke a lot of Muslims, and they all found the attacks cruel and horrible and the hijackers acting against ALL basic principals of Islam, but their protests are simply not "heard" (read: reported) by a lot of media, while this is the general opinion among Muslims, as told to me by a lot of Muslims.