Feeding wildlife, even one treated as a “pet”, is a death sentence for them just as surely as if you had fired the gun yourself. Your neighbor killed that moose.
Other prime examples include: feeding alligators (now you’ve created a danger to others as well, so you’ve not just killed the animal, which will need to be destroyed by officials, you’ve potentially maimed or killed a person); feeding ducks and geese (I once has a neighbor that would feed ducks in the parking island adjacent to the main entry to our apartment complex, no surprise to me that we saw many near misses and a few dead ducks in our driveway); bears (this one should be obvious, same scenario as the gators except bears are faster, climb trees, and are probably smarter than the average person they are going to encounter when they leave the woods looking for human food).
Undomesticated animals (wildlife/wild animals) are not pets. They’re never going to be pets. They’ve just learned to manipulate some humans for food or shelter. Maybe you’ll get along for a little while with them, but that relationship has poisoned the fear keeping them safe for and from other humans.
This whole idea that they “saved” it is philosophically flawed and deeply problematic from a moral and ecological perspective. Claiming that the mother “abandoned” it demonstrates ignorance of the way these animals live and care for their young.
Regardless, a proper wildlife rehabilitation program by a zoologist would have actually kept the moose alive and been in a position to judge if the moose was safe to be re-released. Your moose story could have easily ended in the death of people in addition to the moose. This isn’t some kind of vain high horse I’m on. It’s just simple facts learned through decades of direct experience with wild animals in the wild, in rehabilitation, and in zoos. I stand by my earlier statements. I’m sorry this bitter pill is hard for you to swallow I guess. So it goes.