It’s inadequate because the FBO’s have used inadequate procedures involved with the storage of various chemicals. The article even states that the NTSB has advised fluids should kept labeled and that the DEF shouldn’t be kept near flight line fuel products. The EPA, in this instance, isn’t even regulating aviation as you seem to keep thinking. They’re regulating diesel trucks, plain and simple. Yes, I’m fully aware pilots cannot tell if Prist or DEF has been added to the fuel. That is out of our hands. Is it scary to think our fuel could be contaminated by something we can’t even detect? Heck yeah. However pointing blame in the wrong direction does not and will not help. Also just FYI, the fuel nozzles for Jet A and Avgas for helicopters are for the most part indistinguishable. The only protection for wrong fueling is the pilot, however you still don’t know if you have received good fuel unless you wait for the fuel to settle and then sample for water etc. Every FBO I fuel at is independently audited on a quarterly basis by my company for these very reasons. Again the fault is solely of the FBO’s and the staff working in an unprofessional manner, and I have no doubt the lawsuits you mention will come to exactly the same conclusion. And by unprofessional I mean the way everyone involved in aviation should be conducting themselves. Professionalism in this sense is what stops mechanics throwing any old oil into the engine because oil is oil right and, just like DEF and Prist, Mobil Jet 254 and AeroShell 15W-50 look and smell pretty much the same.
Ultimately if someone at the FBO was involved in automotive racing and had ethanol fuel laying around in an unmarked container and ramp personnel put that in with the Prist would we even know? Who would be liable then? The EPA still?