Yeah, all of your points are correct, but that certainly doesn’t mean that all modern pesticides are safe.
Also, what a number seem to be are hormone disruptors. That’s probably half of what’s turning modern American males into Democrats—with the other half being all the birth control pills in our water supply! ;-)
Creating certain strains of corn or wheat that are resistant to, say, Roundup is probably bad news in a couple of ways. That makes it easier for our seed supply to all be patented, uniform and tightly controlled, and that makes it easier to crank up the level of pesticides used—and the level residue that is in turn to be found on our food supply.
You don’t have to be a liberal to take issues of, yes, necessary pesticides into consideration.
There's a big plus side for using Roundup (and the like) — soil conservation. No-till farming saves millions of tons of topsoil annually, and improves the soil in many other ways. No-till farming depends on the use of weed killers.
http://www.scientificamerican.com/article.cfm?id=no-till
As for what's “turning American males into Democrats” — birth control pills may have something to do with it (although that suggests that feminization and leftism go together; and that doesn't explain the growing number of very rational conservative women). If you want to mention hormones and birth control pills, you should also mention unfermented soy products. Soy milk, for instance, is loaded with so much phytoestergen that you'd be safer drinking ordinary milk, to wash down birth control pills.