When I was growing up in the '70s, I only knew intellectually, from books, about the wars between the religions. The Christian Crusades in the Middle Ages. The Muslim Jihad. I thought those days were long (and I mean LONG -- many hundreds of years) over. Not so. Aside from 9/11, which I thought was anomalous (and based purely on a left-over grievance from the creation of Israel), I haven't had to think at all about Muslims attacking me.
What with Paris and San Bernardino, though...ugh... The latter co-assassin a Middle Eastern radical Muslim state employee who'd been working among the co-workers he ultimately killed... I've never even thought of the concept of a "Holy War" before. That term formerly seemed extremely outdated and too-intense and not even applicable to anything going on today. But...but... I'm not even a practicing Christian, but I'm getting pissed off. At the constant documented random beheadings and stonings documented overseas. Which is terrible enough. But then you come HERE, to the Western world, to do your shit? ENOUGH, ALREADY. I don't give a fuck what you do or blow up in your own part of the world, but... don't come to the US and think you can pull off the same shit. SICK OF IT. You want a fucking old-school war between Christians and Muslims, like circa 1000? OK, then. Just wait. We've technologically developed just a little bit more than you have.
As a college student in the '80s, I debated intellectually over the morality of dropping The Bomb on Hiroshima... Easy to judge 40 years later. What about in the heat of the moment, though? Now is "The Heat of the Moment." I'm all for crushing the opposition. By whatever means necessary.