It's called confirmation bias nontypical, and we are all inflicted with a health does of it. The problem is, some of us admit we have it, and others never will, because they don't believe they do.
Regarding hunting Yellowstone for predator/prey/habitat balance, rather than expecting wild predators to do it for us: Hunting game that migrates out of the Park is not the same as hunting "in the Park", nor is it an effective nor reliable management tool to manage over/under populations of big game animals.
If the Park has a problem with predator/prey/habitat balance, it can not be left up to "a natural ecosystem" to solve the problem.
There is not a Park/Wilderness area, in the lower 48 States, large enough, remote enough/isolated enough from human influence, that it can survive in an "natural, pre-modern man" environment. Especially our National Parks.
The idea that the National Parks, Wilderness Areas, or Monuments, can be managed "hands-off-by-humans" so the ecosystem can "go back to nature" and "return to it's natural ecosystem" is absurd. Completely and utterly "bat sh!t crazy". In fact, it's not being managed hands-off, the Park Service just pretend it is when they talk to Park visitors then they claim it's hands off, for the benefit of the Park. In reality the Park Service manage the hell of these Parks, they just manage them "their way", and claim it's "hands-off" for the best interest of the ecosystem. Horse pucky!!
If, as has been claimed, the bison are still a habitat problem in the Park, the Park Service can quickly and efficiency solve the problem with "highly controlled sportsmen hunting" INSIDE THE PARK, and explain the need for it to the public. Those who love the Park and want the best for it, will understand and appreciate it, and the one's that oppose it, for sociopolitical reasons can go to hell, because, it's these folks that are destroying the Park, because of their flawed agenda.