That's not just cops and military, it's true for just about any trial where split second decisions were made. The judges and juries have the luxury of hindsight and the 'real time' issue is just another consideration that has to be taken in with everything else.
but when you remember there were a handful of cops, and one bad guy armed with a rock...
and the bad guy was running away after being shot/tazed...
They were not in immanent fear for their life, sorry, but I don't see it at all. He's trying to get away. This isn't trayvon on top of zimmerman punching him... this is bad guy wearing a bullet and/or taze, trying to run, getting shot with hands empty and up.
Tough to blame "heat of the moment" when dude is fleeing wounded unarmed. I have higher expectations of LEO - you know why? because if you, or me, or any other civilian shot a guy legally - then CHASED HIM DOWN and killed him unarmed with hands in air acter crossiing the street - it's be prison time
and we're not trained as well as police.