...and your belief the police officers are guilty is, of course, based on your long study of all the evidence. /S
Ipso Facto, res ipsa loquitur.
There is sufficient evidence of sufficient quality to warrant charges and prosecution.
You seem to be confusing guilt with probable cause. Let me illustrate:
Probable cause => trial => guilt or innocence or mistrial.
And that’s a helluva lot more than they gave Freddie Gray who’s death they caused through malfeasance, nonfeasance and misfeasance to varying degrees.