"So one case is the basis of your entire (flawed) argument?"
Yep,
just one ,a href="http://www.cbsnews.com/stories/2003/03/04/n
a tional/main542678.shtml">case.
Then, you go on to acknowledge that my flawed argument is in fact, in part, correct:
"Informants are most often criminals, yes."
Now, we venture into "fantasy land":
"In most cases, the informants are rolling on someone to negotiate a reduced sentence for themselves."
Would you think this would make their testimony more or less reliable?
"Further, the "entrapment line" is not exactly thin: to be considered entrapment, an accused criminal has to be forced to commit a crime that they were unwilling to commit, e.g. "Buy this weed or I shoot you." "
No, entrapment means that the criminal commits a crime that he would not have otherwise committed. Many of us are willing to buy drugs and wouldn't have to be forced to do so, but the undercover officer has to be careful to use specific words and not to use other words. That's because offering drugs to someone is creating a crime from thin air. Were you not there, no crime would have been comitted. Creating crimes is not the job of the police.
"If you willingly give an undercover cop a suitcase full of money for a trunk full of cocaine, it's not entrapment - it's good police work."
Actually, it sounds like the start to a great weekend, minus the undercover cop of course. So, selling cocaine is great police work, but buying it is a crime. Interesting that you have gotten that all straight in your head somehow.