I don't think we will ever understand the amount of death, literally, that Monsanto's products have caused. And what's worse is they were fully aware all along, and still the US government had their back.
But starvation is less of a problem anymore, largely because of agricultural advances like fertilizers, machinery enabling better practices (like no-till farming) and yes, herbicides and pesticides.
Undoubtedly there are harmful side effects but they need to be viewed with a sensible cost-benefit analysis.