"I can go on and on if you like, honestly, where do you think the “rules and regulations” come from Baton Rouge?"
That is, in fact, where they come from. The Louisiana DNR predates the EPA by several decades. Why are you so insistent that reading an EPA webpage makes you an expert?
And "Enviromental Liability" isn't or shouldn't be the issue. If anyone takes a lease with obvious environmental liability then they deserve to go out of business . But saying it goes against the previous owner is completely naive, the previous owner is almost always out of business (especially once any claim is made) and the current owner gets stuck with the cleanup. The state sees to that.
And if you take a lease with unplugged wells, I guarantee it will be the current leaseholder that will be liable for plugging them. Some of these old leases in this area may have scores, even hundreds of unplugged wells.
This is the way it works, regardless of what an EPA webpage says. But just keep on reading, I won't bother you anymore, it's clearly a waste of time.