Comment by Nursie

That seems a little bit of an odd interpretation to me.

Persuasion is honest. "Hey, I think you should do this thing because of reasons a, b, and c, there are some downsides like y and z. It may mean something to me peronally, so I may also to appeal to you to do it for me as a favour. I may even play up how important I think it is."

Manipulation is dishonest. "Hey, I'm going to use an underhanded technique to make you feel like you're missing out on something, or are inadequate, to get you to do this thing. Maybe I'll go overboard on flattery and inflate your ego to achieve my end. I also might lie or omit some of the downsides to give a distorted view of the risks"

Even if it's a win-win situation, it's still manipulation if you're seeking to bypass someone's agency.

> Are you manipulating a person if you either omit a truth or do a white lie because you know truth at that moment in time would be worse for their life.

Yes, certainly, and that's why people often get upset about "little white lies" too. Maybe you are doing a good thing, maybe you're not, but removing agency from someone by keeping the truth from them is always manipulative.

The wiser question may be "is manipulation always wrong?" And I'd argue that if it gets your kids to calm down and go to bed on Christmas Eve, maybe not ...