I like your cartoon. The difference with the dividend flow is that the payment was made... not for a good or service (which all the other flows have in common) but tax on a repayment. Not a fixed, negotiated payment either... A repayment that is, interestingly, not in the control of the shareholder. Thus differing from a loan.

I would no longer purchase stocks -- I would then prefer bonds (loans). Which means I would take risk into account, and this would stifle (some) innovation.

I don't mind taxation at all!