forks, knives, baseball bats, hand guns, hunting rifles, etc, all have other legal purposes.
there is no other legal purpose for assault weapons than massive deadly assault.
certain types of weapons should require higher regulation of who can own them and for what lawful purpose.
whoever applies for a legit lawful purpose should be required to achieve certain high standards of training, etc...
Would 20+ years in the military meet your high standards of training?