That data would be inadmissible in the murder trial. Lethal force is only privileged in response to an imminent lethal threat that the privileged act is the only way to avoid. The shooter’s life was not in immediate danger and killing the CEO isn’t likely to change the policies. You’d have to make your decision in the jury box without it.

I agree if caught he should be prosecuted. I’d be real conflicted about it but I could convict. He either did it or didn’t.