What would you say about someone who tried?
What you tell the Crusaders? Yassir Arafat? Eh?
Hummmmm?
I don't say anything to dead people. I am not Catholic anyway, so I would not defend what they did, except to say this: If they had been successful, we wouldn't face the problem we do today.
Also, it is my understanding that the Crusades were in response to Islamic atrocties and attacks in Spain.