The Crusades were first and foremost about the armies of allah — they were invading Europe and desecrating Jerusalem, the holiest place on earth.
The crusades were about politics, money, and getting the thugs out of Europe (Christian thugs).
I'd be fine with dropping an asteroid on Mecca today, but the crusades? Nah... that was not iustum bellum.
Hell they weren't even smart wars.
Clusters, we call them today.