Trademark should have been Copyright, you're correct.
However, the creator of Megaman is no longer at Capcom, the creator of Final Fantasy is no longer at Square, Sega is no longer Sega, but owned by Sammy.
The companies that bankrolled the entire thing are still there (or--shocker--have been subsumed into another company, which spent money to acquire its assets). Your excuses are poor ones designed to paper over that you want something for free and can take it so you will. At least the guy who says "fuck 'em, I can take it and nobody will stop me" is honest.