There have never been many terrorist attacks in the US. That is why 9/11 was shocking at the time, it was the first major terrorist attack on american soil ever.
Ok statistics on mainland US 2004-2011. 18 total attacks with victims, 5 by islamic groups/affiliations that's 27%, 3 by environmental groups 16.6%, 1 by neonazi/white supremacists 5.55%, 1 by anarchists 5.55%, 3 by "unknown family member" 16.66%. Out of 74 total casualties, 56 were by islamic groups/affiliates, which is 75.67%.
I'm a little surprised actually. Never heard about any environmentalist attacks.
I included christian terrorist attacks IN THE PART YOU QUOTED and white supremacists. If you blow up an abortion clinic, you're a terrorist. If you plot to overthrow the US government and live in trailers in the middle of nowhere and refuse to pay taxes and blow stuff stuff up, you're a terrorist. The white supremacists are I'm guessing mostly christian.
If you belong you're brown, islamic, strap a bomb to yourself and run into a restaurant yelling "Allahu Akbar." YOU ARE PROBABLY A TERRORIST.
You think you are putting forth a unique perspective by not judging. It's not a bad thing. But in this discussion you are just denying reality. The vast majority of terrorism is perpetuated by Islamic groups because it's culturally acceptable and they generally lack the funds to wage conventional warfare. 50-100 years ago, I would've said communist rebels, because at the time they were in the same position. 160 years ago I would've said American-Indians.