If homosexuality were preventable should it be prevented?

[Nobody]

I can see a reason to 'cure' a lot of issues in the world due to peoples predisposition far before thinking homosexuals deserve a special treatment program.

No i think homosexuality isn't harmful and since the world is overcrowded its a good natural way of slightly going towards preventing over population.

Great point.
So going with your observation and tweaking the OP question a tad, ask how many heterosexuals would volunteer to be 'cured' of being straight?

If it helped to save the world from the overpopulation factor that's making survival and especially in third world countries, an issue?

It would be an interesting take to see how many people who are all for homosexual rights, volunteer to become homosexuals.