[ Vanitas doesn't deserve it. But Ven does at least? ]

Even if you were found out, it still wouldn't give anyone any answers. You pulled the trigger, but you weren't the reason he died. He and those he might have been working with got him killed.

[ There is an important distinction. ]

Look at it this way, you now have something that could be used to flush out more killers. And keep Akira safe.