Surveillance is not a solution. I would say surveillance isn't needed if the root cause of that problem is actually solved. Take for example, country A goes to

Surveillance is not a solution. I would say surveillance isn't needed if the root cause of that problem is actually solved. Take for example, country A goes to war with country B or destabilizes it. Now people in country B will want to take revenge. Individuals will want to take matters into their own hands for the injustice done to them(making them so called terrorists -there is also religious terrorism which I believe is all for silly reasons). And because people in country B are also humans, many many fellow humans in country A will also sympathize with their sufferings and would want to correct their own country. Some of them may turn to become "terrorists". Now the root cause for creating terrorism was country A itself. There is also the problem with media. Giving religious terrorists the attention they crave is the last thing we should do. That only gives them a sense of satisfaction.