This strikes me as the reaction of a person who has had it up to here with moose. Perhaps they had an accident involving running into a moose, or a moose hassling their family or pet, maybe eating their trees, garden,  jack-o-lantern, etc. They want to just get rid of all the 'city moose' that they see. That still doesn't condone their actions, of course. 
I recall a young moose that didn't like the garage door opener. If I tried to raise the door he would just come unglued and attack it! I was late for work occasionally. 
Another one got all peeved at my teen-aged kids when they wanted to run in the house and pick up some money. I ended up luring him off to one side with oranges and then putting the money in a jar and tossing it out the window to them while he was looking the other way. They jumped out of the car, grabbed the jar and leaped back in and sped down the driveway in reverse. OH, WAS THAT MOOSE MAD!
He got even: He peed on the lawn and all the grass died in those spots.