You’re saying each and every Crusader was a believer? Every one?
ealgeone:
That is something that I do not know. My guess is the majority were baptized Catholic and taught the faith as young people. As some got older, some probably had fallen away, that does not make them beyond redemptions.
Some were true believers, yes, some maybe lukewarm, some had fallen away. But most of those who fought did so to defend Catholic Europe from Islamic invasion and threats. By every standard, the Crusades were a just war.
That does not mean individuals, even though the war was Just, did not do things that were unjust. WWII was a just war, but there were times when U.S. Serviceman killed POWs. the US directly bombed civilian cities, as did the British. None of those actions were morally just strictly speaking, even though the broader war to defeat Imperial Japan and Hitler’s Germany were both Just Wars, hence one could argue the culpability of the Bombing of Civilian cities is less, but still I would argue unjust. Civilians, unless they are shooting, are non-combatants and classic Catholic Just War Doctrine going back to Saint Augustine would consider it unjust.