We are limited to freedom in a governing state and in as much as there is a set of constitutions for the societies to be abided to, you don't call that decentralization because you are living by the rule of laws.

And the laws are being stated to regulate humans so we can live a peaceful and well coordinated life in the society.
So due to barbaric senses of human being taking laws into their hands by making the societies unbearable and ungovernable, there is said to be a need to arm yourself for self defense and not for oppression.

So you should be able to differentiate between the preposition of those who are legally and illegally armed with the guns.