Why did Jesus die?

Seems that God is quite keen on blood and carnage. Global flood kills millions, wars with his support, fire and brimstone kills hundreds at Sodom, plague and disease against those that annoy him etc. I guess he wanted to torture and kill something even cleaner than all the innocents he'd already murdered, so created a perfect being who he knew in advance was going to be brutally murdered with no real justification. Have you seen the movie Passion of Christ? Its one of the most horrific deaths I've ever seen, and with the power that God and Christ are meant to have either of them could have stopped it but didn't.
I really don't think "Lord why have you forsaken me?" is the cry of someone who understands their fate.