You mean the compounds so secret that there's a wikipedia page listing them all?
First, there is no reason to believe that list is exhaustive. According to the page itself, it is "a partial list of the chemical constituents in additives that are used or have been used in fracturing operations." It was only released in 2011 in response to a congressional investigation, having been held secret for 60 years. Nor does it help you know whether fracking fluid is mostly toluene or mostly liquid nitrogen (personally, my guess is that there is very little, if any, liquid nitrogen in fracking fluids, but it's on the list)
Second, from a random sampling of MSDS:
- 2,2-Dibromomalonamide: No human toxicity studies have been carried out with this product. Not evaluated by IARC.
- Poly(diallyldimethylammonium chloride): Not evaluated by IARC. No carcinogenicity information is available
- Carboxymethyl hydroxypropyl guar: Carcinogenic effects: Not available; Mutagenic effects: Not available; Developmental toxicity: Not available
So, under the proposed legislation, even if you know what the chemicals are, you have to wait for someone to get interested enough in them to perform ecological, carcinogenic, and mutagenic studies with those specific chemicals and publishes the results. Until someone proves that a compound is carcinogenic, it would be regulated like it is not carcinogenic.
Perhaps you are willing to have your dinner grown next to a factory that can hold its chemical waste secret for 60 years, and then be unable to regulate that waste for another few years or decades, waiting for someone to bother to measure their health effects. Maybe you believe that no company would knowingly or accidentally release chemicals without clear confidence in their non-toxicity (even if they can't release that data to the public). Maybe you trust those companies, more than the politicized EPA, to balance their profits against potential harm to humans and environment.