If you need someone to blame, look no further than the people on the Eagles board that were probably banned from here for doing just that. I wasn't around for any of it, but I'd wager that things probably got very out of hand, considering the level of intolerance that we now use as a guideline for personal attacks.
Its a shame. I agree that having opposing fans around would keep things interesting. Its just too bad that so few of them are capable of staying in line.