right to defend also gives you right to hurt someone unnecessarily like we have seen in the news especially in the case of schools in the US, background checks should be a norm, also there are approx 300 million guns in the states so auditing them is an impossible sort of task so background checks, weapon limit, types of weapon sold can be put into consideration while selling a new one. students should be sensitized from an early age about weapons if they are gonna grow up in that place.