Ever had the "talk" with your veterinarian? The one where he gives you the sad face and says, "Rover had a pretty good life, but it's time. He really needs to be put out of his misery, and it just isn't fair to anybody to let him go on like this". Every wonder if the same rules should apply to miserable old cranks? Ever wonder if crabby complaining about children harmlessly enjoying themselves, should be listed in the medical literature in the "when is it time to put your grumpy old curmudgeon down?" section?
If you are that miserable that you are horrified that children are harmlessly enjoying themselves, it's time to stay home and limit your misery to the four walls of the room you are in. Stop spreading your disease.