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The round isn't meant to be used by kids. It's for men. The muzzle rise in automatic fire is dependent upon the centerin of the barrel axis. In most cases a fully automatic weapon is not necessary. Fully automatic mose is no substitute for marksmanship. Anything within 300 yards should be hit using semiautomatic fire with one squeeze of the trigger. If any enemy are getting closer than 150 yards in reasonably open conditions it's a sign of poor training.
Combat ussually won't occur in the open where you can easily shoot the enemy. It might be in the city, it might be at night or in the jungle, and the soldier will be firing at the enemy while exposing himself to fire. He might even be reacting to an ambush and have a need for suppressive fire.
While full-auto may be inferior to aimed semi-auto fire most of the time I'd still want the ability to switch to it if necessary.