Criminals have no difficulty getting arms from many places; the black market, other nations (if near a border) from gang leaders, and even by walking right into a gun store if their criminal identity is still quite hidden.
well i am thinking that these particular people, who are the root cause of your worries, are not criminals. in that they may be children without criminal records but with access to arms.
i am interested in specifics, not generalities.
you can go argue in abstract about rights etc., but it is the specific circumstances of each case in these schools which should guide your response.
if a disturbed child stole his mothers guns, then there is a specific and positive response you can take, but you need to know the exact circumstances of how the arms were accessed.
then you can formulate regulations to counter that particular problem.
going off on a crusade against an imaginary threat on your personal liberty is a waste of time. you should investigate fully and in detail how these arms got into the wrong hands and formulate a response to that particular weakness in the laws or regulations of your state.
it is a case of learning and responding to each school tragedy, not of reacting to some perceived threat to your own civil liberties.
you are responsible for your arms but also as an armed member of society you are responsible for correcting lapses and found weaknesses in your arms regulations.
after each school tragedy you should be able to reduce the chances of the next one occurring by learning and taking positive action yourselves as a community and as a state responsible for its arms regulations.