OTOH, most of these training videos exist for stupid reasons. They don't make brokers any better at navigating ethical dilemmas -- as the content is usually 100% obvious -- nor make them any more predisposed to be ethical. And they training videos did that, and they do actually watch them, said brokers don't remember any of it two days later.

The training, and its mandate, basically exist to protect someone else from liability: "see, we told them you can't lie to potential customers, not our problem!" And that, in turn, probably exists only because we tolerated that defense:

"Yeah, I [did obviously unethical practice] ... but no one never told me I couldn't!"

So we all go through the motions of watching a mandatory training video that tells us nothing we didn't already know and won't remember anyway.