It's fascinating to me that some people are asking the founders to return money that comes from a fair sale of equity into the company and not from some, say, p

It's fascinating to me that some people are asking the founders to return money that comes from a fair sale of equity into the company and not from some, say, public source. Is there some kind of psychological background that explains these people's views? (Assuming there is no ignorance of the process of funding of startups)