Several people want a bunch of ammo in case they attacked by several people.
I guess they think the bad guys are going to patiently wait while they are being shot. In reality while you shoot one all the rest are going to be shooting you and you won't even get to the second person.
I have read that in WW2 and Korea unarmed groups would try too over run a machine gun so even with an unarmed group how many times can you pull the trigger.
I know there is a 1 in 10 blue million chance of needing more than 5 shots but I don't see the reason to run and hide every time a car goes down the road because it might run off the road and hit me. Larry