No, I don't need it for hunting.
No, I don't particularly like to fire off multiple rounds just for the hell of it. That gets kind of expensive and simply wastes ammunition.
I'd also like to point out that the right to keep and bear arms is not granted by the Constitution. The Constitution simply bars the government from taking away that right. Also note, if the ability to do something is given to you, that's not a right that is a privilege. The right to keep and bear arms is an inalienable right.
All that aside, what is the primary reason why the American people need assault rifles?
...to protect ourselves from the government.