After all the petty bullshit, Saudis like to party too. The problem is their government and society is repressive as hell, and they're so scared to confront it, they have to go into this whole make-believe world where they act as heroes by attacking Israeli servers. It's pretty funny. I'm sure Israelis will recover. The Saudis on the other hand still live in a medieval hellhole where women can't drive a car... and this really doesn't do much to change anything. Their time and energy would be better spent trying to bring civilization to their own wasteland.
[Edit] I should add, the fact that if you did this in your own country, you'd probably have your hands cut off, is a powerful motivation to go after somebody with more liberal values.