The US Constitution makes it clear that the people and the military are not on the same page. The US people is supposed to have access to all the weapons that the military has... According to the old law.

This is a cultural consequence of achieving independence from an oppressor. People who desire control of others will always organize, oppress and build militaries. They invade, so peace is not an option with this personality type. Hence why seemingly normal people can buy machine guns. - There are predators around.