Utter nonsense. Unless I am a slave I own my labor. By extension, if I choose to convert the product of my labor into a house, a gun or whatever, I do own it.
Because we are all equal people with equal rights, we all share equally the ability to enforce our own rights. Out of convenience, we agree to allow the state to act on our behalf enforcing our rights. If the state did not exist, we would settle these disputes ourselves.
In this specific instance, it is very rare that anyone's right to life is being infringed. Property rights are being infringed upon. If you, by infringing upon my rights, declare yourself outside the bounds of natural law I have the right to defend my inherent rights using any means necessary to dissuade others from following your example.
The government routinely oversteps its bounds but my rights remain intact. Always.
And the various constitution's provided a way to compensate you for your property rights.