Is it though, or is that just the hook being used to drive traffic?
They found a correlation between the size of the African American population and the percentage of government revenue from fines, but what evidence is there that the cause is actually racism? The article essentially explains the cause -- African Americans tend to live in higher crime areas, which leads to more police presence in those areas and thus more fines.
In other words, the real problem is that the cops can fine anybody for no real reason (and some municipalities use this for revenue generation), and that problem disproportionately affects African Americans because they have more proximity to more cops.
The problem with framing it as racism is that support for a cause is generally motivated primarily by self-interest, and if you paint it as "this is a problem for black people" then the majority of voters hear that as "this is not a problem for you" when in actual fact it is a problem that affects everyone.
It's always been about money. The people who have it and the people who don't.
Why would they write more tickets on a population that doesn't respond to them (context: according to TFA some already have fines for "missed court dates" etc)?
If you want to generate revenue, wouldn't you go hard on writing tickets in a middle-class neighborhood, where the population makes enough money to pay the fines but not enough to have the time/resources to fight?
[0] please Google the name - information is readily available, but the links are too politically charged for this particular discussion.
And a many-armed one, at that!