It did turn sour because those who are bickering about the scrappers are those worried about the value of the pins.
My daughter will wear pins because she likes it being Tink or Mickey, not because it is a rare find or its more valuable than the others.
Along the lines of one poster, the look the same, feel the same, what's the big deal?
Apparently you didn't read enough because as I said before, it's NOT about pin value. I've never sold a pin, never considered selling a pin. Maybe you think I'm lying about that?

The value issue has been consistently only brought up by people arguing in favor of using scrappers and bootlegs.
As far as "look the same feel the same", that part I can at least get behind. Some do indeed look the same and feel the same and on that note I can even say that a number of pins in my collection I suspect may be scrappers, but they look basically the same and feel basically the same, so the small differences (such as a small detail on the back of the pin like saying "Series X 1 of 4" when it should say "Series X 4 of 4", or a missing minipost) I can easily put out of my head, and put it right in the collection with the rest of the pins and call it a day.
A friend of mine got a Gadget pin off of eBay - he's a HUGE fan of Rescue Rangers and had wanted a good Gadget pin for a long long time. This particular pin was only sold as part of a framed set of which only 50 were made. We're fairly certain the pin he bought is a bootleg - but it looks so close to the real thing, neither of us really cared. We can't tell the difference, since it's for his own personal collection, no point for us TO care really. It was an awesome pin, and he kept it and is very happy to have it.
Many, however, do NOT look and feel the same. Missing design features, obviously wrong colors, poorly formed moldings, distinctly lighter and cheaper materials, etc etc. At this point I wish I had a couple of these on hand to sit beside real official pins to illustrate the difference. Alas every one of this nature that I've acquired has gone in the bin.
Just ask yourself this - Disney has certain rules when it comes to pin trading so what do you think the intent of the rules are? The intent is make sure only official Disney pins are traded, to maintain the integrity of the experience for everyone. Unfortunately, no rule they can make can keep scrappers and bootlegs out completely. It's sad, to me, that so many are willing to knowingly put junk out there.