Like anyone living a repressed life some Muslims are going to have violent issues later in life. Their madness is culturally-based because their repression is culturally-based. There's you're terrorists.
It's the converts in the West I worry about. They use Islam as a mask for their animosity, cultural hatred and lack of civility while avoiding the social requirements and controls of Islam. They're the real Islamic scumbags in my opinion.
Traveling in the ME you'll find Muslims are usually nice and normal people. Even if you encounter some who don't like you/the West you can still deal with them cordially if you hold your ground. That will gain you respect and even some degree acceptance. They're traditionalists and with a little tact they are easy or even pleasant to get along with. Some of the most cordial traveling experiences I've had have been in Arab countries with Muslims. All the normal personal dynamics work and in the end most actually value the West for the gains its made and the opportunity it holds. Many look up to us, so lets display decent character and not look down upon them, eh?
We should hold Muslim cultural extremists responsible for 9/11 the same as we hold the West's cultural extremists responsible for their attacks upon America. Both extremists hate our freedoms, success and strengths whereas the vast majority of people in both cultures value them. Blame the extremists, not the people.
Islam is extreme. The entire history of Islam, btw, is full of the constant re-conquering of Islamic countries that have made the mistake of growing more “moderate” - by other, more orthodox “extreme” Muslims.
If you’re a guy and a reasonably well-off American, traveling in Islamic countries is probably fairly painless. But living in an Islamic society would be an entirely different matter, and that is what they want to impose on all of us.
Does this mean it’s the first thing that every Muslim thinks about when he wakes up in the morning? Of course not. But enough do, and they have orthodox Islam on their side, which is what makes them so dangerous. Converts are dangerous because they haven’t gotten lax yet - and the cult in its pure form is nothing but a ruthless system of political and social domination.