Gay behavior was once sick, too
And gays paid a huge price for that. They were persecuted, prosecuted, murdered. Still are in some countries, I just read about Chechnyan gays who vanish without trace.
The liberal approach in developed democracies has been adopted in order to alleviate the life of people who haven`t chosen their orientation but were born with it. What should gay people do upon discovering their nature? Commit a suicide? Go to the mountain woods and stay there?
Besides, don`t you understand that hostility bears only more hostility? One day certain influential people decided that it is time to put an end to aggression against gays because it only provokes bad emotions and conflicts which spoil the atmosphere in the country. Isn`t life better when you live among happy people?
Now imagine you were born gay - how would you feel if the society rejected your attempts to lead a normal happy life?
Hence my words "live and let live."