And no, it's not to make money. It's simply to say that GMOs are bad.

I mean that's what ShinRa was doing with SOLDIER and Deepground. Sephiroth and the like are just GMOs.

And did anyone else think he 'killed' Vincent out of jealousy because he knew Lucrecia really loved him, not Hojo? And perhaps his 'experiments' on Vincent were meant to fail as well. Jealousy is not unfamiliar to Hojo, he wanted to surpass Dr. Gast, just like Hollander in CC wanted to surpass Hojo.