Why wont users like yourself on the side of use of Emulators admit that the majority of the ROMS out there are pirated.
Because users like you are shifting the argument from "Are emulators legal?" to "Are ROMs legal?", then using the fact that many illegal ROM sites exist to go back and say "See? Since most ROMs are illegal then emulators are, too, and they don't deserve a place in our society."
It's a plain logical fallacy, and you're arguing with your lives for something that doesn't even benefit you.
ETA: In addition to that, you "emulator legality deniers" (for lack of a better term) misuse the fact that emulators exist for current- or last-gen systems to say that "emulator users just want to pirate games", when 1) it's not true in the face of emulators existing for obscure systems and 2) anecdotally, most emulator players I know use eg. a switch emulator to play the games that they own on cartridge from their PCs or Steam Decks in an upscaled resolution.