Not sure how that degree makes you an expert in toxicology or cancer research, but I sure hope you've not made your mind up about Roundup being safe. I'm not saying it's not (the WHO is) but from experience I've found that treating potentially cancer causing chemicals with extra care is less likely to well...give you cancer.
But I'm willing to hear your side. Just fyi I don't think the argument "it's the best we got right now or people starve" is any stronger than saying "we can't switch from lead pipes, the people will die of thirst".