I think your patronizing tone on crusade historiography is laughable. I have written and published on the subject, and I didn't just reproduce pop art from the National Geographic. The most recent book I referred to was 2001, not Runciman, by the way.
Patronizing tone? You are the one making false statements - "they killed everyone" - about the crusades. As such either put forth your sources or take that statement back.
As for writing on the subject of the Crusades - anyone can do that. It's seems apparent from your comments that you are no expert in Byzantine or Medieval history...far from it.
We can agree on one thing however: The PC era we live in makes it so much harder to defeat the enemy.