the cause of hoarding disorder is an exaggerated sense of responsibility

Although feelings of ownership emerge early in life, culture also plays a part.For example, it was recently discovered that Hadza people of northern Tanzania who are isolated from modern culture
don't exhibit the endowment effect.That's possibly because they live in an egalitarian society where almost everything is shared.
At the other extreme, sometimes our attachment to our things can go too far.Part of the cause of hoarding disorder is an exaggerated sense of responsibility and protectiveness toward one's belongings.