JEFF JACOBYThe end of the gay marriage debate? By Jeff Jacoby, Globe Columnist | May 16, 2004 THIS IS THE week that same-sex marriage comes to Massachusetts, and thus to the United States. The fundamental building block of civilization is about to undergo a radical change -- a change opposed by a majority of American adults. How did this happen? The joining of gay and lesbian couples in marriage may turn out to be the most consequential development of our lifetimes. How did we get here? The answer to that question has several parts. At the most obvious level, the...