Yes you can. A video of someone murdering someone is 100% sure. Or a crime committed on national television, or in front of 50,000 people (as in a sports stadium) If we thought we couldn't "ever" be 100% sure, beyond a reasonable doubt, then nobody would ever be convicted of anything, and there would be no prisons either.Naw, I probably ignored it with m ost of the rest of your crazy.
The problem is, you can NEVER, EVER be 100% sure.
What the problem is, is that you want to allow convicted killers to have the opportunity to kill again, as they have often demonstrated that's exactly what will happen. Click link and LEARN.
http://www.wesleylowe.com/repoff.html
Do you know the mental health of the person shooting... Cops do it all the time and get away with it..
On top of that you don't know why he killed the man?