Well, democracy without protection from such tyranny of the majority is wrong, because it harms innocent people - the minorities that must obey whatever the majority decides for them.
The difference is that cheating on your partner, or getting a divorce (especially when you have children) is something that harms people. While one person falling in love and living together in a relationship with another person of the same sex isn't something that causes harm to anyone. It brings these two people happiness, and is totally neutral towards everyone else.
By the way, do you believe that divorce should be illegal? That would cause even more harm. It's true that getting a divorce isn't a good thing, but it's a lesser evil. People aren't all-knowing and sometimes make wrong decisions about who they should have a stable relationship with, so there must be some way to be able to correct these wrong decisions.
If a cultural barrier forbids something that doesn't cause harm, then such a barrier should be destroyed. Such cultural barriers are good when they protect people from harm (for example, rape) and wrong when they prevent people from pursuing happiness without harming anyone (for example, homosexual relationships). By the way, people used to believe that interracial marriage is very disturbing and that legalizing it breaks down important cultural barriers.
There's a lot of hatred among many people against homosexuals who just want to live in peace in their relationships.
It's good when the majority harms others.
The repeated assertion that open homosexuality doesn't cause harm is merely an assumption. There is a good bit of historical evidence that such behavior represents a breakdown in a culture, or is at least symptomatic. Having such behavior modeled and held up as normal will eventually influence out children. We know this because different societies at different times have accepted a wide range of behaviors and had them proliferate, even if self destructive. Human sacrifice is not even beyond the realm of possibility as far as the things a society can grow to accept.
A fellow commented on a blog I left on Town Hall the other day, "Never remove a wall if you don't know why it is there." Sound advice.
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