I never said that they had to believe them, but it is their best interest to go out of their way to not hear anything that would get them in legal trouble. Sure, there are attorneys who find out that their client is guilty and still have them lie on the stand, but those attorneys wouldn't admit it because they'd be guilty of perjury. And since most attorneys are generally law-fearing and/or don't want to get into a situation that makes them confront the bad part of their job and/or have a moral issue with claiming a guilty person is innocent, they have to go about it in a certain way so they never have to confront the possibility that their client is guilty. In a way, that is "believing in your client". Even if you think your client is an evil person who no doubt killed the guy, you're going to want to separate those feelings from the case and operate so that that hunch you have isn't confirmed, either in court or in private. That was my point. It's not really "believing in the client", but it might as well be called that since that's what the end result appears like to everyone else. In reality, it's more like "Not getting yourself into a situation in which you could be caught falsifying testimony".

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