Tycho
Humans are sometimes too curious for their own good. In the Garden of Eden man asked ‘I wonder what would happen if we eat the forbidden fruit?’ and since then, Man continues to steal, kill and destroy to satisfy curiosity and urges.
If eating yourself and siphoning your own veins is unacceptable then the power you seek is not in the act of eating but in violating and causing harm to another. Or maybe you wish to prove yourself deviant to laws of nature. Either way the satisfaction comes from the Power to do Evil without Conscience.
ION I hope none of these people have really tasted blood except in a fight or accident