May sound like a stupid question, but what about the family honor if you turn against a fellow Mafioso and kill them? For example, instead of testifying against Michael, supposed Pentangelli had him killed instead. What about the family honor then? If he succeeds, then he's obviously the Don. If he doesn't, then he's a dead man, but would his brother lose honor in the same way? It's just something I've never understood. How can testifying against someone be worse than killing them?