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.
I suppose you like to pick fights, and I suspect I have run into you before. I just have a PhD in Medieval history. That's all. Killing the enemy was a time honored military tactic which had its good points. Maybe you might find that in your old magazines, if you look.