I find that peoples understanding of this issue is way too simplistic. It won't help to stop terrorists because they will always use the internet in ways that

I find that peoples understanding of this issue is way too simplistic. It won't help to stop terrorists because they will always use the internet in ways that cannot be monitored (https, VPN, etc.). It will allow the gathering of everybodies data in one place, which is dangerous as hackers are regularly gaining access to this kind of information. Another problem is that innocent people are sure to be branded as possible terrorists and refused entry on flights etc.