If he's human, he will die tonight. There's no question about that. Otherwise, Suburu will be able to name two assassins instead of just one. In other words, as long as Suburu's alive, we can't kill kuwarudo or Suburu.
If both of them are still alive by tomorrow, then whether we kill them or not depends on what the coroner tells us about the person we killed on day 2.
This isn't taking sides; it's just logic! Besides, bringing your personal emotions into the game as a "reason" to vote someone off sounds very wrong to me.
edit:
In summary:
Killing them hurts our chances at winning more than not killing them (for now).
Learn maths!
If both of them are still alive by tomorrow, then whether we kill them or not depends on what the coroner tells us about the person we killed on day 2.
This isn't taking sides; it's just logic! Besides, bringing your personal emotions into the game as a "reason" to vote someone off sounds very wrong to me.
edit:
In summary:
Killing them hurts our chances at winning more than not killing them (for now).
Learn maths!