"Judge a man by his questions rather than his answers" - Voltaire
"There is nothing noble in being superior to your fellow men. True nobility lies in being superior to your former self" -Hemingway
I do think, at this point, the DA and city/county overall are deeply concerned at the potential civil unrest due to the demographics and number of unemployed African-Americans, which is averted merely by adding "murder" to the charge. I suspect the prosecutor's office at this time is more concerned of that potential than the case itself. I would expect this case to plea out when enough time has passed so that it is history.
You can never be safe from a government that can keep you completely safe from each other and the world. You must choose.