[wrench]

“
Because nobody wants to be that “first guy” in line who will catch three bullets in the chest.”

No one wants to jump on a live hand grenade to save his buddies, yet it has been known to happen.

A pilot doesn’t want to ride his crippled airplane into the ground to avoid hitting innocents , yet it happens with some regularity.

[Blue Jays]

"...Diving on hand grenades, pilots guiding crippled aircraft away from innocents..."

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Because those are trained warriors in combat.

Orlando victims were just people going out to socialize, drink, and try to hook-up with people.
They were not planning on a battle that night, against unknown assailants, with unknown capabilities.
Most were likely looking to run AWAY and find a fire exit, service door, or other path away from the danger.