Hi HKB! How's my buddy?
I thought at first this would be easy, but your second example got me thinking. The first sentence "...ask for them" is clearly plural. The second sentence, to my ear, sounds OK both ways, "...rights are a human..." or "...rights is a human..." If I were writing this, I would avoid the conflict by making something else the subject of the sentence, "...the idea of rights is a human..."
By the way, they and them are what we have for a plural form of the pronoun it, it doesn't matter if the it is abstract or concrete.
Student or Learner