Using this example, many Fundementalists believe it does affect them by erroding the morality this country was built on. They do not want to see gay marriage announcements in the newspaper and TV. They do not want their kids exposed to that sort of stuff.
All of the so called victimless crimes and other areas that we would say are STFU types of things, others believe impact them.
I can not understand that view. Very few people I know hang their marriage license on their wall for everyone to see, so I do not see what difference it makes. But others do. Somewhere in all the debate, is what makes America strong. SOmetimes I cannot find it, but I know it is there.