Another important fact is that homosexuals average very low life expectancy.
There is, therefore, a very strong case to be made that society should try to alter the environment of children to make it less likely that they will choose homosexuality.
The most common way societies have chosen to discourage unwanted behavior is to punish it and to prevent any positive depiction of it. Such methods must have some efficacy or the world would not have evolved as it has.
YOU lurk here?
Does it tick you off that so many of the denizens refer to you as "Hildebeest", "Hitlary", and other such unflattering names (to say nothing of the pictures)?