Some people use this to mean justice is supposedly impartial, and some people use this phrase when in disagreement with a court decision (like the ump is blind). What was originally meant by this phrase?
“They’re coming to take me away ha-ha, ho-ho, hee-hee, to the funny farm where life is beautiful all the time… :)” - Napoleon IV
The phrase is meant to indicate that only the evidence, not the parties presenting it, will influence the decision. As pointed out above, this is why the lady with the scales is blindfolded; only the decision of the scales matters.
They would like you to think it was but we all know that bribes, biases Etc make it far from that. It should be deaf, too, in a perfect world,it would be but then everyone would be responsible for their own actions & we would not need the court.