It WAS more than that when you consider how many Jews they murdered along the way. Why did they have to do that?
Most folks along the way, were slaughtered or dispersed. It was about taking booty. And the Crusadering armies by necessity lived on the land. The lines of resupply were non-existent.
It was a nasty and brutish time. I just want some evenhandedness, so that the main point, "Islam attacks, Christianity counterattacks" is not transmogrified into "Christians' Murderous Crusades against the loving Muslims."