a commodity, thereby conflating authentic impartial justice with economic power. Market anarchists counter that having defense and courts controlled by the state is both immoral and an inefficient means of achieving both justice and security. Libertarian socialists hold that liberty is incompatible with state action based on a class struggle analysis of the state. Mandatory vaccination RIght-libertarians are divided over mandatory vaccination. Some oppose mandatory vaccination on the grounds of it violating a person's individual liberty and being skeptical of government authority. Others support mandatory vaccination, arguing that libertarian principles prohibit reckless behaviour that puts other people at risk. According to Voice of America, "opposition to vaccination is often couched in libertarian terms: It's my body, my choice." Natural resources Right-libertarians such as free-market environmentalists and Objectivists believe that environmental damage is more often than not a result of state ownership and mismanagement of natural resources, for example by the military-industrial complex. Other right-libertarians such as anarcho-capitalists contend that private ownership of all natural resources will result in a better environment as a private owner of property will have more incentive to ensure the longer term value of the property. Other libertarians such as geolibertarians or left-libertarians believe the Earth cannot legitimately be held in allodium, that usufructuary title with periodic land value capture and redistribution avoids both the tragedy of the commons and the tragedy of the anticommons while respecting equal rights to natural resources. Propertarianism Right-libertarian philosophies are usually strong propertarians that define liberty as non-aggression, or the state in which no person or group aggresses against any other person or group, where aggression is defined as the violation of private property. This philosophy implicitly recognizes private property as the sole source of legitimate authority. Propertarian libertarians hold that an order of private property is the only one that is both ethical and leads to the best possible outcomes. They generally support the free market and are not opposed to any concentration of power (monopolies), provided it is brought about through non-coercive means. However, there is also a minority of soft propertarian libertarian philosophies. According to this moderately left-libertarian perspective, a society based on individual liberty and equal access to natural opportunities can be achieved through proportionate compensation to others by those who claim private ownership over a greater-than-equal share of the aggregate value of natural resources, absent any improvements. Non-propertarian libertarian philosophies hold that liberty is the