One prosecutor made that deal, different prosecutor use it.The prosecution really screwed it up because they made a deal NOT to use his sworn statement to prosecute him ... then did it anyhow. I'm glad he served what time he did but he should have been kept behind bars until the grim reaper showed up.
Anyway, here's my favorite joke about Bill Cosby:
Q. What's Bill Cosby's favorite pickup line?
A. Hey, does this smell like chloroform to you?