Why is libertarianism so infallible?

Libertarianism is the inclusion of every sapient being into the decision making process and all that logically follows from that. Utilitarianism is the objective of ensuring the most happiness for all sapient beings and all that logically follows from that. Sometimes they compliment each other, other times they contradict.

Discuss.

http://dis.4chan.org/read/newpol/1211470169/21
By reducing state interference in the economy to that which is necessary to enforce justice, by preserving property law and business agreements, the framework necessary for people to utilise their economics and business management skills without impediment is achieved. How efficient they are as a consumer, employee and/or manager is another matter.

>My only constellation
>retarded losers with clearly no education