[risent]

Freedom is not free. The majority of world are like peace, but the minority can break it with terrorist attacks. To prevent the attacks, the majority will pay a huge price.

In the other way, the minority's attacks will create Nationalism in the majority, and this will make the attacks more worse.

Is there any way to resolve this?

[andrepd]

This is a false dillema. Show me any evidence that massive surveillance increases security.

There are many things that increase peace and security: wealth, education, good institutions/political systems, arguably culture, etc. Surveillance is probably not one of them.

[risent]

I agree with your opinion. But the problem is that: every option in your comment is a long term policy, it can't resolve the current problem in the reality as quick as possible.