Let's take a look a this:
You're basically repudiating thousands of years of history that culminates in sayings like "All human beings are born free and equal in dignity and rights.
This is a good guiding principle, but no-one seriously believes in its ubiquity. Why are children not allowed to vote? Why are some people taxed more than others? Why are some people jailed up for years? etc, etc.
They are endowed with reason and conscience
Most of them aren't.
and should act towards one another in a spirit of brotherhood."
Yeah, unless they're being a dick...
Hey, it can bring the viewpoint I advocate some temporary advantage, let's throw the whole system down and start discriminating on basis of intelligence. You do know denying voting rights to "stupid" people has a dark, fascist history, right?
Take a person who knows little about politics, the media, the world, or even how various policies will effect them personally. They vote based on personal impression - they like Julia Gillard's hairstyle, for example.
Name one good reason for this person to have a vote, other than the impracticality of discriminating against them?
How about this one? "Everyone has the right to freedom of opinion and expression;
Except if they're expressing racism, terrorism, pedophilia, etc...
this right includes freedom to hold opinions without interference and to seek, receive and impart information and ideas through any media and regardless of frontiers." What if said opinions are, in your opinion, "stupid"? After all, it's not inherently wrong to discriminate against stupid people.
Sorry, this confused me a bit... anyway none of the ideals you mentioned are ACTUALLY considered to be universal. Therefore the question becomes one of degree and context, rather than upholding unalienable and fundamental values...