This. Same with the genetically modified foods. Nearly every food you eat has been genetically modified in some way. Humans have been doing it for thousands of years via selective breeding and grafting. Gee, let's improve a plant's hardiness so poor people don't starve. Herassy!
Organic water goes hand in hand with the raw milk debate. The reason we treat it via pasteurization or chemicals is so you don't die after drinking it.
Say what you will, I drink raw milk because it doesn't cause my intestinal tract to unleash vast quantities of gas-propelled Liquid Fury of Hell. I think that's kind of a difficult thing to fake with a placebo effect too.
Store bought milk results in horrendous gurgling of the guts not too long after consumption, followed by The Desecrating of the Porcelain.
On the other hand, raw milk is so terribly benign that it's one of the few things I can consume in the morning
without it causing some kind of stomach discomfort. (Generally, breakfast right before heading to work is kept light, because damn near anything results in some kind of stomachache. Raw milk causes absolutely no problems at all.)
And if it's collected properly, well, I've not had any issues with it, put it that way. Just clean them big ol' cow boobs properly. I also don't know what all it's got in it - enzymes, beneficial bacteria, or what else - but my tolerance for pasteurized/homogenized milk products has improved as well. Allegedly, the pasteurization and homogenization processes do various bizarre things to milk, which ends up making it more difficult to digest.
Thing is though most genetically modified plants are modified not to be tougher but to be resistant to herbicides, so that the company that made the seeds can then sell you a crap ton of herbicide to drench over your crops.
Also you cant do the normal thing farmers have done for centuries and hold back some of your harvest to sow the next season, you have to buy more from the seed manufacturers.
So no there's nothing intrinsically wrong with GM products, but the way the industry works is pretty rotten.
That's the unfortunate thing. Genetic modification is often presented as some altruistic and benevolent way of helping humanity by making the plants better - just a way of artificially accelerating selective breeding for improved yields or quality of the foodstuff. Instead, as you said, they just make it so that they can chemically nuke the field to kill damn near everything else, and have the crop survive.
And the business practices of some organizations...Monsanto, I'm looking at you, do tend to sour the view of this sort of thing.