Ahh, yes, speaking in absolutes without even trying to qualify your argument with any logical underpinning. It's just biased liberals being liberally biased because liberal bias. Yup, that's how capitalism works: bias for the sake of bias, and irrational economic conduct for the sake of irrational economic conduct.
Yeah: money.
Your proposition that reports of violence against blacks are inherently likely to be over-reported compared to violence against non-blacks is patently false throughout the history of US journalism. And it's a silly white victim-complex narrative.
Corporations make decisions based on profitability, and those that do not die off. This is why a litany of clearly indefensible acts of violence, three of which I cited earlier, did not receive media attention compared to less clear-cut and morally ambiguous instances.
You don't seem to grasp basic logic, once again. Of course bias isn't "exclusive to lies or fabrication." However, to be prevalent on any meaningful scale (i.e. across the how "MSM"), it has to be underpinned logically, unless you really would like to defer your argument to the natural liberal activism of an entirety of a profession that employs a diverse background of persons.