You deserve it because you are effectively lending them your money based on the promise that they will be able to repay it at some point or that you can sell your debt on an open market. ...
From this point I do not deserve it, because they already repayed me
Ugh. If you bought shares, then you own part of the company. It isn't a loan. Any dividends do not dilute your ownership share unless specified in the contract.
Actually, share equity is debt to owners.