True enough, and a good point: it'd be nice to know if BG has voting rights at Monsanto and if so how he's used them. It's a two edged sword; yes you get the chance to make change, but at the same time you're investing your money in dubious activities. I guess the question is whether it's better to make subtle changes from inside the system or to oppose the system by supporting alternatives. And I don't think there's necessarily a right and wrong answer to that one!
EDIT:
I don't think technology existing is inherently a good thing,
tbh. It depends how that technology is used. Pretty much all technology is (to overuse a metaphor in one post!) a two-edged sword - it can be used for great benefit, or it can be used to support a corrupt regime/inflict suffering and destruction. What you generally get is a bit of both.