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.

HAY GUYS, I HERD BUSH WAS A SOSHALIST, MOVING FOR COMMUNITY OWNERSHIP, GIVING UNION RIGHTS OUT, GIVING COMMUNAL OWNERSHIP TO LARGE CORPORATIONS, INCREASING THE TAXING OF THE RICH AND LOWERING THAT OF THE LOWER AND MIDDLE CLASSES

WHAT, HE DID NONE OF THOSE AND HE JUST SPEND THE MONEY ON A WAR AND SOME RETARD THOUGHT THAT WAS SOCIALISM BECAUSE HE DIDN'T KNOW ANYTHING? NO, NO THAT CAN'T HAPPEN