Kevin you don't know me and I don't know you. I speak from my experiences here in PA. I'm sure Maine has different circumstances that leads you to your opinion and experiences. Don't be ignorant.
lol, time will tell. We had open winters(no snow) on the coast many times Fred, Maine has several climates or snow conditions. As to taking them down, I can assure you that healthy deer are no match for them. As to ignorance, I believe Biologist south of Maine are warning their hunters about the likely decline of the deer herds from the incoming predators. Maybe after your friends and family lose pets and hunting dogs like Beagles, you will realize what has happened. Another bonus for the anti hunting crowd that despises the need to control the deer, along with the people that have "deer problems", is that they will wipe out the surplus......Don't need hunters anymore. Plus, deer hunting has been reduced to riding around in a truck for 4 decades in my part of Maine. Only traditionalist hunt the way it used to be done. I am one of them. I returned to Maine 3 years ago for a week at my old hunting camp in Whiting, Maine. It (the town) was listed in Outdoor Life in 1974 as one of the top couple of places in the North East to take a 200+ lb buck, mine was just 200 field dressed that year. 40 years later I managed to see 1 doe in a solid week of hunting and was surprised by that. I didn't go back to my old stomps to get one as I knew the conditions.
I am not ignorant of anything when it comes to coyote and deer. The only effective method was snaring which the Feds banned because you might catch a Canadian Lynx which the Canadians have a season on and shoot them, go figure. Now there are a few pockets of deer where the local men are really aggressive in controlling them. Running them with dogs is the most successful way, but others put out bait piles they can monitor out a window or even have an infrared alarm that beeps in the house. Using night scopes and having permits to take them at night. Trapping (leghold) made a big comeback but it is skill that many do not have and is time consuming.
Not sure why they have not spread more quickly South, but I have the idea that they don't like the hardwood forests. There is a healthy population of deer along the coast from Bar Harbor down and inland to Bangor and points south. That is also the highest people density in the state. Western, Northern, and Eastern Maine are softwood forests.
I have seen quite a few coyotes here in Tenn and over into Ga. They are about 1/2 half the size of the Eastern variety. I also have seen dead ones on the highways in Kentucky, Virginia, and Penn and NY. Saw live ones bowhunting in Kentucky. Never seen one as big as the Eastern. The biggest Eastern I have seen (dead) was 68 lbs. I have heard of them topping 70.
Hopefully my ignorance does not become your sorrow in Penn.
Kevin