There is more than just grandeur in this view of life, bleak and cold though it can seem from under the security blanket of ignorance. There is deep … - Richard Dawkins

I can think of no moral objection to eating human road kills except for the ones that you mentioned like 'what would the relatives think about it?' and 'would the person themselves have wanted it to happen?', but I do worry a bit about slippery slopes; possibly a little bit more than you do. There are barriers that we have set up in our minds and certainly the barrier between Homo sapiens and any other species is an artificial barrier in the sense that its a kind of 'accident' that the evolutionary intermediates happen to be extinct. Never the less it exists and natural barriers that are there can be useful for preventing slippery slopes and therefore I think I can see an objection to breaching such a barrier because you are then in a weaker position to stop people going further. Another example might be suppose you take the argument in favour of abortion up until the baby was one year old, if a baby was one year old and turned out to have some horrible incurable disease that meant it was going to die in agony in later life, what about infanticide? Strictly morally I can see no objection to that at all, I would be in favour of infanticide but I think i would worry about/I think I would wish at least to give consideration to the person who says 'where does it end?'

The resemblance of the signs of the zodiac to the animals after which they are named... is as unimpressive as the predictions of astrologers.

Different sorts of survival machine appear very varied on the outside and in their internal organs. An octopus is nothing like a mouse, and both are quite different from an oak tree. Yet in their fundamental chemistry they are rather uniform, and, in particular, the replicators that they bear, the genes, are basically the same kind of molecule in all of us — from bacteria to elephants. We are all survival machines for the same kind of replicator — molecules called DNA — but there are many different ways of making a living in the world, and the replicators have built a vast range of machines to exploit them. A monkey is a machine that preserves genes up trees, a fish is a machine that preserves genes in the water; there is even a small worm that preserves genes in German beer mats. DNA works in mysterious ways.