It might look bad. But some people care less about looking like a coward than what's good for the overall group. It's just human nature.

[And that's just Light's cynicism eking out. He reels it back in.]

Yes, I was thinking that it's an easy way to prove yourself innocent, and thus narrow down the suspect list. After all, if you know the murder weapon was A, and your role was weapon B, then by declaring your role you would be freed from immediate suspicion.

[A beat.] It would also help us avoid sending the wrong person to their death, again.