They don't do it because he's black.  The DA sees him as an easy target because he seems reasonably honest and he's poor.  Sooner or later the suspect will want to get this over with so he can move on.  The DA knows this, so he/she will con the suspect into waiving their right to a speedy trial then sit on him until he gives in.

Do you know what the DA office really likes? Broke people out on bail with an ankle monitor or 3rd party, these are the easiest to break because they are desperate to stay out of jail.