The short answer is political correctness.
After Sept 11th, our government officials wanted to bend over backwards to prove that we weren’t discriminatory against Muslims. So we decided to thoroughly search everyone, so then CAIR and other Muslim groups couldn’t accuse us of discrimination.
We aren’t allowed to say that some young Muslim man from another country is a higher risk than a little old lady. We have been compelled to say that everyone is an equal risk to hijack a plane or set our shoes or underwear on fire.
This cuts both ways, however. Suppose I were forced to endure heightened scrutiny because a Viking American separatist group was blowing up buildings, and suppose I disagreed with their views. I would be going everywhere, proselytizing fellow Viking Americans to bring pressure to bear on Viking Americans to knock off the anti-social behavior that was hurting all of us, joining vigilantes to route out the problem in our own community, asking for government assistance to help us end the violent trend in our own community.
Now, on the other hand, if this was a group seeking to restore constitutionalism to US governance after the impending and promised socialist takeover of all organs of government my response might be different - and that is the point. My views can be assessed from my stance on the violent activities being perpetrated and whether I am a friend or enemy of the state can be deduced from that stance.