Back before and through the 1960s, anyone arguing against the rights of racial minorities to have the same rights as white people would be considered commonplace, and wouldn't be in too much of a minority in their thoughts and opinions. Signs like "Stop Interracial Marriage!" and "Segregation now! Segregation tomorrow! Segregation forever!" being marched up and down the Mall would not be that strange.
These days (most) people look back at those people and see them as bigots and just terrible people with terrible ideals when it comes to racial issues.
Similarly, do you think that the same will happen in 40-50 years when the US has completed its swing towards being "okay" with gay marriage that it's currently in the process of? Do you think that people will look back at those who protest against Gay Marriage in the same vein as the racists of the 1960s? Do you think that signs that read things like "God created Adam and Eve, not Adam and Steve!" or "Homosexuality is unnatural! Vote no on gay marriage!" will seem equally as ridiculous as the concept of "Separate but equal."?
What're your thoughts on the issue? Will anti-gay/anti-gay-marriage activists be seen as equally the level of bigots as the racist, anti-minority activists of pre-1960s America?
Will hindsight reveal a closer parallel between the two than even we ourselves can fathom now?
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They will look old. Duh.