The Simpsons tv show takes on a lot of the sacred cows of the culture and turns them on their heads. That is why, to be on the cutting edge of what our society is already doing in most places, Springfield needs to legalize same sex marriage and move into the twenty first century.
The Simpsons is a comedy show known for pushing the envelope. With that said, it is a good thing for Springfield to legalize same-sex marriage. The legalization of same-sex marriage is further showing that Americans are willing to allow everyone have the freedom to live their life as they wish.