What confidence do you get out of serial numbers and existence of registry if there’s an entity that can freely print few more trillions? Mtgox was a private e

What confidence do you get out of serial numbers and existence of registry if there’s an entity that can freely print few more trillions? Mtgox was a private enterprise that was managed by incompetent/malicious individuals, why does this always come up in bitcoin discussions? Mtgox is an example why you need to care about owning your money. People who lost money in mtgox didn’t own those money, they gave them away for a promise to have them returned.