The 2nd Amendment doesn't explicitly mention the underlying human right behind gun ownership, which is:

If we have the right to live, we must therefore also have the right to defend our life.

Without the right to self defense, we become ruled over by those who wield more physical power/violence, and we become either slaves or corpses. The right to self defense is no one else's responsibility but our own. It can be entrusted to no one else, because others do not care enough to enforce it as rigorously as the individual would, and such power in the hands of others would invariably be corrupted and turned against us, and without means to defend ourselves, we would have no means to fight back.

The gun is the most powerful force equalizer an individual can carry ever invented. It allows a weak person to fight a strong one, and few to fight many, without assured defeat. When guns are taken away, society reverts to what it was before the gun: those who wield the most physical power/violence rule over everyone else. A slave is a slave, by any other name, no matter how pretty the cage, or how convinced through propaganda that they're not.

To deny someone's ability to defend themself, to own a gun, is to deny them their own humanity, and their right to life.