I'm so sorry for your loss. I feel your pain however. I had my first bear attack Monday. He took out a small coop and killed four of the six bantams in it. Two roos were able to fly into a tree to escape. Like you, I got the same pitiful response from Wildlife. And, I got blamed for not protecting my birds better. Go figure. My remaining birds are cooped in either sturdy sheds or in the main barn. I didn't have the money to put up electric fence but did take a couple helpful suggestion from our local animal control (who was wonderful). Our area has been slammed by bears this year. A 400 bruin, a mama with two babies and a 150 lb. yearling. What he told me was to put up chimes anywhere the bear might encounter them. Additionally to make spike boards and hammer them to windows, runs, etc. Take a 2 x 4 and hammer in nails at an angle so that when you look at the board it makes a V. Put these around anything you are trying to protect. The bear reaches in, gets punctured by the nails and moves along.
Just as an FYI last night my motion light went off, I heard the chimes and went flying out of the house with pots and pans. I made one heck of a noise and the bear took off, not to be seen again that night. I'm waiting for him again tonight to keep up the aversion.
Good luck to you and I hope you can keep the bears away from your chickens.