since the late years of 1930s there has been terror in the region. it was two-sided then, only until israel gained power and first founded an army and then a government and dismissed its terrorist groups and gained the right to exist, while arabs thought it would be street-fighting forever. most of those terrorists we're talking about are people who still cannot accept the idea that a jewish state has been founded in front of their eyes, so they don't accept israel's right to exist and will continue their "resistance" until israel is completely "destroyed". and i'm talking about the leaders.
And the terrorists, not the leaders but the ones who are being used in this inhumane violence, are told that the jews started killing arabs when they recieved support from un (typically, the "west" or, just the "americans") to destroy them completely and take over all their lands and make a holocaust on all muslims. and they look around. they see poverty, they see death, they see destruction. they see israeli tanks. they see soldiers enter their house. they see bombs kill their friends. in southern beirut, now, they see no roads, no bridges, no power supplies, almost no buildings that are still standing. so they think that they have to do something, no matter what it costs. it's extremely natural for them to believe the only guy that tells them to do something to stop "them". they don't even have to hear that they'll get 40 virgins in the afterlife. they are not doing this because they are sexomaniacs. they're doing this because they are desperate. they are so desperate that they can't think that they could hurt innocent people, including many muslims, which is strictly forbidden in islam. they can't think they'll be killing themselves, which is one of the greatest sins in islam. they can't even think about these, and thus, you cannot expect them to think and start blaming nasrallah or whoever.