From what I know, McVeigh and Kazinski weren't part of a bigger group of white people wanting to tear down the US. So, it's hard to profile a group of people if the terrorist acts were individual. I don't know for sure, but I'll bet the KKK and other white supremist groups are profiled in places where they are prevelant.
I think the real question is whether the risk of offending some muslims worth the possible reward of keeping America safe. I say yes.