You made a costly mistake when you left the Dodge dealer's service bay without demanding a share of the "contaminated fuel" that they based the warranty refusal on. Now you have no proof that the fuel was clean, or, for that matter, contaminated. No evidence = no proof of your position.
I've never heard from a fellow Dodge owner or read on the TDR about any dealers claiming fuel was contaminated and denying a fuel system warranty claim.
I have no idea whether your fuel was contaminated, or not, but keep in mind, a dealer is paid for replacing bad parts whether by Chrysler under warranty or by you if it is not.
I suppose it is possible that dealers may know that Chrysler is in such dire financial straights that they are slow-paying or possibly not paying for warranty claims, don't know, but an honest dealer is not likely to do that.
It is possible also that your local suppliers have heard of claims of fuel contamination from dealers in your area which could mean that there has been actual contamination in your area.