The FBI agents in Miami suffered from the same mindset - or lack thereof. They were ready to find the bad guys and arrest them. Not one of those agents on scene backed away or ran. But they didn't have it in their heads they might have to shoot and possibly kill anyone.
Bite your tongue before you say that about Ed Mereles. He was in the fight from the start and performed above and beyond the call of duty.
Grogan lost his glasses and couldn't see. To place yourself inside his head, or the heads of others, is taking quite a bit of liberty with the subject---isn't it?