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.

The US can't stand a partial war with Iraq, and you think that Canada would not do the same as the Iraqis? It would be far easier for Canadians to infiltrate the US in a war and the US would have a situation similar to Iraq but in the US.