Entrapment is a concept that can only be applied when one of the parties in question is a member of law enforcement - and it requires the persuasion of an individual to commit a crime they otherwise would not have committed. Simply recording someone and editing them to look bad would not have anything to do with entrapment, and on an everyday basis, absent law enforcement officials being involved, entrapment doesn't apply.
But that isn't what you said. You said that anyone who records someone without their consent has a moral deficit of character. Obviously if someone behaves nefariously via the medium of recording someone else, that represents a deficit. Absolutely, I agree. But an abuse victim recording legitimate abuse should not fall under that category. And it is completely fine if you actually meant
specifically nefarious recording.
I'm not trying to start a fight or semantically nitpick, it's just that what you stated above very much came across like your attempt to chide the OP for their urge to engage in this behavior, and implying that they would possess a weak character if they did that. And I would say absolutely not, the OP's request would also not fall under a nefarious purpose as the OP intends to record a confession of actual abuse.
If the OP lives in a one-party consent state (and that is a huge, significant
IF as
@Friday pointed out - so please do get a lawyer's opinion, specifically a lawyer who is local to your area and knows your area's laws), there is actually a ton of legal precedent for law enforcement to use recordings of this nature to obtain convictions in domestic abuse cases.