if I find that you stole from me, the consequence might simply be that I’m no longer your friend and won’t help you when you need it.

But that isn't capitalism, is it? Good luck hoarding capital if all you're going to do to prevent someone from living in a building you own but don't use is no longer be friends with them. Good luck preventing workers from using the means of production for their own ends if you're just going to be angry that they're not giving investors a cut.

More semantically, what you describe is called "belonging", not ownership. Likewise ownership without any consequences for violation is called "association". Generally speaking I am fine with using words broadly, but when you are weaseling your way out of the violence underlying capitalism then it is important to note that capital ownership is not merely capital belonging to someone or capital being associated with someone.