People use the word "atrocity" quite often when describing something they hate (a movie, a book, etc.), so I really think you're reading way too much into that. And the fact that the creators completely wrote off every fan who disagreed with their decision really demonstrates that they weren't concerned with our opinions in the first place.
I'm aware of their reasoning. It would hold more weight if sales were plummeting and
One More Day resulted in vastly superior sales numbers, but that isn't what happened. Love it or hate it, JMS's Spider-Man run was a very profitable period for the character. Sales were in a very good place (you can look at them here:
http://www.comichron.com/monthlycomicssales.html), but Marvel went ahead with
One More Day anyway because it's what they personally wanted for the character. Marvel has made their distaste for the marriage abundantly clear for years, not caring how many of their fans actually liked it and completely got rid of it without considering how their readership might feel about such a decision. Again, Marvel's argument that the marriage had to go in order to appeal to a broader audience would have been more sound if sales were low and consistently spiked after
One More Day, but that simply wasn't the reality of the situation. The reality is that they eliminated the marriage because they had wanted a single Peter Parker for a long time.
No, those relationships went absolutely nowhere. Name one memorable or impactful thing about any of those characters. Like I said, they never progressed anywhere and were all dropped from the series due to lack of writer and reader interest.
The point is that Marvel got rid of something that many readers liked and really had nothing to show for it. Again, why did the marriage have to be eliminated for any of those stories to occur? It didn't; they could have easily been told with the marriage in place. It just paints Marvel in a selfish light once again.
I've already addressed these questions.