Cuba embargo vote at the UN

A few days ago, the UN voted overwhelmingly to request that the U.S. end the embargo against Cuba. The vote was 183-4, rejected only by the U.S., Palau, Marshall Islands, and Israel (for some reason, the Federated States of Micronesia abstained).

These days, it's just plain hard to defend the embargo and sound rational, especially since we've opened up to China and Vietnam. For example, part of the U.S. response was that:

The measures had been maintained in an effort to promote the exercise of human, political and socio-economic rights for all Cuban people.

I'm still trying to figure out that logic.