"Deserve to die" and "whether or not they are fun to kill" are two different things. ^_^;

The Planet knows how to take care of itself, that is evident. The Planet is quite capable at keeping itself going. Of course, the Planet isn't one concious soul like a human (uh, homo sapien), it is made of Lifestream. It's not an issue of The Planet vs. Human Beings, it's simply the Planet surviving. The Weapons were created at first to destroy Jenova, a virus, and then woke them again to gather enough energy to stop Meteor. If humans had to die, so be it, says the Planet. It needed the life energy. That's that. Nature isn't always pretty, but that's how it works.

So I wouldn't say the Weapons DESERVED to die, they were doing their job. "Deserving to die" is certainly a matter of opinion.

But as far as I'm concerned, they were put in the game to be beaten, and they're a challenge and I enjoy the battle. So of course I'm going to. ^_^