@Pavel I getcha there.
But if the client is lying to you, you can’t really help them explore reality. And that’s not your fault. And one thing abusers often do is present things with the roles reversed so they’re the victim who needs validation. (My ex succeeded in doing with his therapist, and with a significant portion of my friends’ group. He soon began to abuse them, so they all went, “Oh shit, G was right,” and dropped him hard, but years later some of those friends are still ashamed and uncomfortable and this is sad to me because it wasn’t their damn fault.)
I think for therapists it’s kinda like that thing where opiate addicts try to sue doctors who prescribed for them based on their lies about pain. The doctors turn around and sue them for fraud. (This is why, in more recent years, those transphobes who think it’s a gotcha to ‘prove’ that gender-affirming care is over/wrongly prescribed by lying about their gender to a doctor and getting a script, as if not having magical truth-detecting powers is malpractice, have just written dumb articles about their fraud where they don’t mention their informed consent form, and not gone to court.)