As others have mentioned, Rashad is a deeply intelligent person. I remember seeing her give a live interview at Signature along with Condola, and it was like magic listening to the two of them spout beautiful, poetic wisdom. It was like watching a play, but it was just them speaking off the top of their heads.
Eloquence, and careful articulation of ideas, are skills that she has in spades. So I think we can assume that if she had more to explain, she would and could explain it. Which is why it feels like such a punch in the gut to see her Tweet this tactless statement, with a crude, tone-deaf follow-up that does nothing to actually help her cause.
I have a certain degree of empathy for people who are blinded by denial and circumstantial bias, but that empathy only goes so far, and doesn't put her above criticism - she is an intelligent adult woman with her own mind.
As for "she is not the criminal here." Yes, I agree it's important to keep things in perspective, and not let Rashad's comments eclipse the actual, physical harm done by Cosby. But Cosby's actions are "old news" - we're all on the same page there, so there's little need for discussion. Rashad's comment just happened today, so it's natural that people would want to discuss it more than they want to discuss Cosby himself. And I don't necessarily think she deserves to have her acting career ruined because of this. But "she is not the criminal" doesn't mean she didn't do something wrong, and it doesn't mean that she isn't still causing harm in a less direct way.