A right of the individual

If a state militia guarantee rather than an individual right of citizens to keep and bear arms were the purpose of the Second Amendment, it would have been totally unnecessary and irrelevant to include any guarantee of ‘the right of the people to keep and bear arms,’ since by its very nature a militia is necessarily an armed force and without arms it would be impossible to carry out its constitutional functions of suppressing insurrections and repelling invasions.

The Second Amendment

[T]he enshrinement of constitutional rights necessarily takes certain policy choices off the table … Undoubtedly some think that the Second Amendment is outmoded in a society where our standing army is the pride of our Nation, where well-trained police forces provide personal security, and where gun violence is a serious problem. That is perhaps debatable, but what is not debatable is that it is not the role of this Court to pronounce the Second Amendment extinct.