Think of it this way, you're a real life tank crew member, your ride is stuck, you have a very limited view of whats going on around you, one of the crew is bleeding and yelling, and you have no way of being sure an ATG or Tank crew isn't closing the breach on the round that is going to enter the vehicle and neatly decapitate you in the next few seconds.
Do you sit there thinking, "Hmm, only down 1 crewman and immobilized. Our armor is thick and we are well supported by infantry, let's fight men!"
Or
"Get the **** out!"