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.

>>120
You cannot accuse me of using weasel words when you talk of "freedom to the masses" which is an ambiguous term that could mean anything from tyranny of the majority to absolute economic freedom. You will need to be specific.