Recommended reading: "DDT: A Case Study in Scientific Fraud" by J. Gordan Edwards, PhD (entomology).
Dr. Edwards was a stalwart in defending DDT from what he felt was fraudulent, activism-driven science. He was involved in numerous studies showing DDT didn't impact birds. For years, he ate DDT on a regular basis in front of his students, to demonstrate how benign it was to humans. Edwards died of a heart attack at age 84, while hiking, after having directly consumed a lot of DDT for more than 30 years.
Meantime, the DDT ban is estimated to have substantially contributed to tens of millions of preventable deaths from malaria. Rachel Carson may be the greatest mass murderer in human history, and she is lionized by environmental activists.
Bottom line: There are evil forces at work on both sides of these issues. Either side will lie to get what it wants, and there are legions of allies that will support the lies.
Do I trust Monsanto? Not particularly.
Do I believe that Glysophate is harmful to people when used as directed? No.