Your entire argument is the same as "why should we teach them about sex?

Kids should be taught common sense and self control about not getting STD's and unwanted pregnancies. They should not be taught to masturbate, supplied with pornography, or have sexual vices promoted to them. The should not be told experiment, they should not be told that perversion is normal - because it isn't.

My argument was very clear: They are not teaching 'gay people exist'. They are promoting degenerate, non-reproductive behavior that harm the construction of families and weakens the nation.