What August said, also full auto fire does not really increase leathality unless you are at point blank range, it is used for suppression, pin down the enemy while others manouver to a position to take them out. People tend to have an aversion to sticking their head up with bullets cracking by over their head.
In the context of most shootings done by a lone gunman it would be a liability rather than an advantage, with organized groups though that changes quite a bit but assault rifles have a very short time where they are capable of providing supressing fire since the weapon overheats and seizes up, even with maschine guns designed for that role have to have frequent barrel changes t allow hot barrels to cool off while maintaining suppressing fire.
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