Aiming for a more equal (more just) society.  

Yup.  That's it.

Some more info, should you want more than just my say so on that...

And you can find lots more from 

Headquarters for the authors and the movement is at "The Equality Trust"

And yes, there are naysayers.  Read em all!  I can tell you which side I find more common sense and more believable.