Maybe the people who hired Dennis Allen are more reluctant to admit hiring Dennis Allen was a mistake than the people who didn't hire Dennis Allen.

There is a difference between access / vantage point and smarts. The guy who built that Titan Submersible knew more about it than any of the outsiders or consultants who were concerned about its safety, but his additional information, access, and vantage point did not translate to a sound evaluation, because he also had the most biased view and the most invested in his previous course proving right and visionary, so he could not see the flaws because he had too much invested. The Saints front office, coaching staff, salary cap structure, and aging roster are kind of like the Titan Submersible. The guy who built it believes it can withstand pressures down to 4,000 meters, but outsiders see the warning signs and can hear the walls cracking after 3 straight years of league leading spending for mediocre results and an aging core.