It's entirely another to make a claim about facts which is not supported - in this case by evidence that is not controversial.
It's simply not so that black people commit crimes in proportion with the representation in the criminal justice system. In fact, if poverty and geography are controlled for, ethnicity and race seem to be non-determiners of criminality.
This is explained, among many other places, here: http://www.huffingtonpost.com/kim-farbota/black-crime-rates-...
Does this mean that you upvote greytext comments because it makes the text too difficult to read, and you find that upvoting such a comment not infrequently makes it easier for you to read it?
If yes, then you might be pleased to know that you can solve the contrast issue by selecting the text with your mouse or whatever other pointing device you use.
I can't speak for the community at large, but PG has condoned downvotes as a signal of disagreement.
If you prefer to make your own decisions about what comments are worth reading, and use Firefox, here[0] is a userscript that will unfade them.