... Alderaan's destruction also had pretty much nothing to do with Anakin. Or Leia, really. Tarkin wanted a planet, any planet, to demonstrate the station's power on, and Leia happened to provide an excuse to make it hers. But even if Leia didn't exist, Bail still did, so there was every chance that it might have been Alderaan anyway. Again, though, Vader was just there. He wasn't making any of the decisions. Tarkin was in charge of the Death Star, and Tarkin was the one who chose to fire it.