I feel like the guidelines of the Human Rights are just and ideals for the population of a country or a group of people, and morally less corrupt than the guidelines or values of many political parties. They have been around for many years, and yet many countries still fail at ensuring that these basic rights are respected, and enforced.
In their original form and without much modifications, they could stand as the core values of a political party. Or, in countries where these rights are supposed to be enforced but rarely are, political parties could pretend to enforce these rights better.
And yet, I don't think that a political party has ever claimed to do any of that, or make it a central part of their political program.
I wonder why, and if there's an "obvious" reason for that that I'm missing completely.
EDIT: I do realize that many countries "pretend" to respect the Human Rights and abide by them. Nevertheless in these countries nothing is actually being made buy governments to reduce the inequalities between people, treat everyone the same, sanction abusers, etc.