Now, as for the question. The problem is after 9/11, everything changed. People did task the government to prevent further 9/11 attacks and sadly, they can only do that by doing what they're doing now. IMO, 9/11 wasn't the point of what the terrorists were doing, but the aftermath of it.
I'm the man who believes that we don't deserve security if we use it to justify the loss of our rights. However, that belief is easily shaken when and if my family are harmed in an attack that could've been foiled, and my first reaction would be, why didn't the government stop it? So, you can see the problem right here.
Nothing is worth losing our rights over, we fought so many wars to protect it, suffered so many loss as the result of the wars, and yet, we're giving them up easily for terrorism.