'Opinions' are the problem here and are usually the cause of most flame wars. That's not to say that there shouldn't be opinions, but most folks seem to start with the belief that they are 'right' no matter what and the facts better damn well fit that belief, even if they have to be twisted into place. Instead of, say, starting with all the facts and then formulating an opinion from them. Or picking a viewpoint to argue from (even if you don't firmly 'believe' in it) and taking it from there.
Then there is a widespread use of fallacies (errors of logic) on the Internet, a subject which deserves its own thread/website/encyclopedia.
This thread started on the wrong footing entirely. With a subject of "Paying For Emulators Is Just Plain Wrong", we are being told what the outcome should be before we've even read the actual text of the thread itself.