6 million Jews died during WW2.
And an extra 5 million other "unwanted" people. The handicapped, the homoloveual...
There would be a lesser chance of a secondary attack if people hadn't blown it out of proportion. It's called terrorism because they wish to instill terror. By acting like a bunch of bawling babies every time a couple of guys give you a "boo boo" all you are doing is encouraging them.
9/11 was hardly a world changing event. Terrorism, hate crimes and genocide has occured across the world (especially in 3rd world countries) for centuries. All this was was an eye opener for a rather large bunch of ignorant people who care more about owning guns and the stock market than global affairs.
If anything, it was a good thing.