Most people who support mass surveillance when asked in surveys only do it because they don't fully understand what's happening. Let's go back to John Oliver's recent show episode where people seem very concerned that the government would have their naked pics - yet they were completely unaware that the government actually does that (as in collecting everything, including their naked pics).

So most people just don't fully (or even partially) grasp the government's surveillance power right now. The media doesn't help here. The media is supposed to inform people about this, but instead either it doesn't talk too much about it, or if it does, the mainstream media is usually pro-mass surveillance (because the powerful friends of the networks are).