Gardening Organic is really shorthand for a whole bunch of ethical choices. One choice is that the produce will be healthier for us, but another is that its production will cause as little hurt to anyone and anything else. There might be little difference chemically between watering tomatoes with comfrey tea and wood-ash as against Tomorite, but if Tomorite isn't Organic then you don't know what ethical choices the manufacture has made that you wouldn't be happy with.
Central Government has its own standards for testing what 'safe' means, and it doesn't have a terribly good record of choosing public health and ethics over commercial pressure. DDT, Iraq, BSE, thalidomide - all 'safe'. Organic is just a different test that's rooted in a different philosophy.