What I see in this thread is a guy doing something he knows is going to be unpopular, announcing his actions, and acting surprised and victimized when the majority are against it.
Does this guy have the right to do what he wants with his Galaxian? Yes.
Does the community have the right to react to it? Yes, because he made it a community issue when he announced and detailed it.
Does this community tend to pile on when they see something they don't like? I don't think they do - unless the person acts like this guy is acting. If the guy just said "well, it's mine, I get that you guys don't like it, but this is going to happen" the community probably would have let it go. The fact that the guy couldn't deal with the opposition, and turned it into a "me vs all of you" situation, is what brought so many people into the thread. Is that necessarily fair? I don't think so, but he knew it would happen, given that this guy has been a BYOAC member since 2003 (Sir Auros) and 2005 (the original poster).