Sony has basically given incentive for us to pirate every PlayStation game under the sun. With their decision to axe the storefronts of three systems and consign thousands of digital games to oblivion, the company has fully telegraphed its regard for entertainment software.
Whether it's PSP, PS Vita, or PS3, you might as well just download everything. At least one Sony executive would agree with you - the one so blinkered he can't even understand why you'd PLAY old games, let alone buy them.
It is morally okay to pirate all the PlayStation games you like. Sony basically loves it.