Its our beef with them. I think you as a south asian can see both points of view far better than as an italian or as an arab. Because you stand outside and can see both aspects.
I'm aware of Arab attacks on Italy and the ''Sack'' of Rome by Arab raiders. But on the other hand Crusaders were hardly liberators, they massacred Orthodox Christians in Jerusalem. Later Crusaders wrecked havoc on Byzantium Empire. Sounds more like some powerful lords of Europe used religion to gain land and wealth. They got the opportunity when the Pope called for the Crusades. That's my view on the whole Crusades thing, you may wish to disagree or agree.