LIke I said, overreach.
But these agencies exist to complete the mission provided to them by elected representatives. They create regulations, etc based on that mission. It's not perfect but the EPA, in your scenario, acted on information provided to them by another party. We could always fund them properly so they are able to do the investigations necessary to not have the scenario above (of course, I have no idea what they were told so who knows).
So, what's the end game here? Eliminate all federal agencies tasked with education, housing, environmental protections, securities, treasury, transportation, etc. etc. etc.?
And have Congress pass laws surrounding administration? Or would Congress provide administration of these often very technical regulations, etc?