Felix is not gaining great happiness, and indeed is accumulating unhappiness. Although he numbers only one, this equation bothers us highly. What would Jeremy say? He's dead of course, and so are we all eventually.
Sorry to get legalistic and philosophical, but we need air support at times like these. Hand to hand moral battles are tough.
As his carers on Earth, we have certain ultimate powers. We've made a decision, and it is due to be enacted today. Please remember Felix as he was, not as he is now, or whatever he will be hence.