Are you implying that the mentally disabled dont contribute to society i believe a little angry Austrian man had that same idea.
And eating meat of a sick animal sounds quite unhygienic to me.
New proposal: if we start eating all of the people who eat animals starting with those who eat the most meat, we will reduce the planet's meat consumption quite rapidly.
If we start sending all the vegans to camps in poland starting with the most vocal we will reduce the planets quota of loud vegans. Wow who would have guessed killing a specific group of people will reduce the amount of people in that specific group. Again the angry austrian dickhead was working on that exact principle.
There are many studies that suggest having pet can increase health both physical and mental and is correlatory to longer life expectancy. Your dog is contributing to society through your actions so dont let em down.