On the topic of ownership and evil twins

Again, my good friend Rebecca Elvy made me think of something, which turned into a blog post - the question about ownership. As Rebecca puts it:

Ownership means you’re invested. It means you have to care about what happens, because you’re invested. And because you care, you become attached. This is usually a good thing.

So how come it can be difficult to let things go, once you have developed a sense of ownership? Most likely it is because ownership has an evil twin in possessiveness - the feeling that no one will be able to treat the topic for which we feel ownership with the same care as we do, and that sharing it will cause us to lose control. And once we become possessive, we have difficulties seeing that we might do better by releasing the object of our ownership and let it flourish under less restraining conditions.
In isolation, the feeling of ownership will allow us to let things go (as soon as we see that they will be taken sufficiently good, perhaps even better, care of) - it is only when we become possessive, the problem occurs.
So it is a good thing to consider, whenever we feel a strong sense of ownership towards something: is this actually turning into possessiveness, or would I be able to let go if it was all for the better? (Translated from Noget om ejerskab og onde tvillinger)