The real problem is not with drones, or spying. It's the monopoly of violence that people think is okay. Government = violent agency that achieves any of its goals using threats with a gun. Taxation, regulations and border controls - all of it is a gun pointed at you if you disobey.

If you dislike what any group of people are doing:

1. They are typically funding themselves. 2. You can boycott them peacefully. Not pay them, discourage others from paying them, ostracize people who you disagree with etc. Without violence, absolutely voluntarily. (Everyone does that every day on the market by choosing what to buy and where to go and what NOT to buy and where NOT to go.)

So with the government it's a different story. You, for instance, not against drones. That's fine, I will not advocate any violent action against you. But if I am against drones, I cannot withdraw my participation. Taxman will point a gun at my face if I refuse to pay taxes, or try to use alternative currency (to bypass inflation) where it's not "allowed". So people who dislike some gov activity cannot do anything about it. And that's the real source of anger. They can do all the talking, but cannot vote their money out of what they dislike.