It's not really about the individual people. They're probably all pretty normal interpersonally. Our systems reward this behavior, so people do it. Surveillance is desired by the politically and economically powerful, and the contravening forces are weak and largely unorganized. Do we punish politicians or businesses for bad behavior? No? Then they'll engage in whatever behavior advances their interests.

You could purge the world of every single person with evil intentions, and things would maybe get better for a little while, but without fundamentally changing the underlying rules of the system the same thing would play out again with different actors.

You pay a third party to make something like this for you. They can best be described as nihilists.