It says right there that you should protect peaceful people. The terrorists are attacking because they view Americans as terrorists themselves. The terrorists view what they are doing as self defense. This is why I think the US should seek nonviolent means to handling the middle east as each side continues to attack and believe what they themselves are acting in retaliation.
The problem with this is that it seems these people do not care who they attack. America, France, England, Africa, Israel, each other...
You remove America from this equation, and I think we should be much more hands off (or all in, as a world, but that won't happen), and they will stilll be killing and plotting.
When these nutjobs say they won't stop till they are all dead or they control the whole world I believe them.