I had a better way of articulating it, but I went with that.
So for the longest time I felt like I shouldn’t give people reasons behind an answer because you can put in the reasons behind it can sway their decisions. Also I know that I had incomplete data set. Humans do lean on each other to think and you can inject what idea and have it spread.
To attempt something more coherent. You can do propaganda when you try to reason. It’s just natural to talk as if they know and just bridge the gaps in their knowledge with any old phrase


I got a better answer just by reading a definition of manipulation:
It is as much about the means as it is about the purpose. So if you are manipulating a kid so they behave in a way that will help him get throug life this is not manipulation. But if you manipulate them into something that only serves you… Yeah that is manipulation.
So in case of convincing someone in a debate it depends. If you goal is to win a debate by manipulation, so you can feel as a winner, that is manipulation. But if you want yo educate them this is not.
You can shape the personality of adults if you really wanted. Children will take after their parents, but that could be because of genetics.
So if you wanted to go by dictionary definitions “serve one’s purpose” can be expanded to parasitism and and symbiosis. You can to see for mutually beneficial purposes. Or you can just see for purely selfish purposes and at the cost of the person you’re receiving (scam).