What most of those have in common is that at the time and location of the shootings, law-abiding citizens were prohibited by law from carrying a firearm and the shooter was able to continue his rampage until either (1) he ran out of ammo, or (2) law enforcement arrived, or (3) somebody else ended the rampage through the use of force (or threat of armed force).
What most of those have in common is that at the time and location of the shootings, law-abiding citizens were prohibited by law from carrying a firearm and the shooter was able to continue his rampage until either (1) he ran out of ammo, or (2) law enforcement arrived, or (3) somebody else ended the rampage through the use of force (or threat of armed force).
Look through that list in post #2 and you'll find that most of them ended the shooting themselves and ended up killing themselves and/or simply gave themselves up (waiting for police to arrive)
And, in the two latest two public shootings (listed above) after the Foot Hood killings -- you'll see that one killed himself and the other simply waited at his mother's house for the police to arrive and gave himself up.