Richard Marcinko, a former head Seal and anti-terrorist, writes books that mix fact and fiction. His most recent book "Vengence" is rather interesting in that it rather strongly implies that despite violating peoples rights, privacy, and for that matter the American Constitution with the excuse of protection against terrorism that the US is really just as open to real terrorism as it ever was.
His main point is that anyone can easily secure weapons from many totally lax U.S. government installations, that infrastructure such as electricity and water systems are open to easy intrusion, and that even nuclear plants close to large cities such as New York are as insecure as they ever were.
The "appearance" of fighting terrorism is masquerading for any real progress and protection of the American public in that area. It is probably worse in other countries, since we don't have access to the same level of weapons and protection technology as the U.S.
Ronnoco