Homosexual acts promote corruption. It makes those that participate vulnerable to blackmail and manipulation. It preys on the weak (emotionally), and destroys lives (emotionally, financially, physically thru diseases) and families. It is a terrible choice that people make. Some that revel in corruption use it for financial and emotional gain. Others use knowledge of it to hurt all involved.
You want to claim that it is all joy, joy, happy thoughts (deceit), that is fine. To teach that to children is absolutely, wrong.
That can only be the case in a society where it's censured, illegal, etc. The easiest way to remove the potential for 'blackmail' that you claim to be concerned about, is if ones' private sex life with consenting adults is a non-issue.
Your assumption appears to be that homosexuality is a 'choice'. I doubt that's accurate at all. Nearly every situation can be described by a bell curve graph. People are not 'smart' or 'stupid': there's a gradation between, and different types of intelligence. People do not have one or another eye color, but at least 6 different colors. And although the standard genital equipment comes in only 2 forms - sometimes babies aren't all that obviously one or the other. It IS a possiblity, rare though it be....
Additionally, there are bisexual and transgendered individuals of both sexes - so it seems obvious there is some biological componant to this situation. I can't imagine anyone 'choosing' to be in these situations. And the ones I've encountered didn't seem any crazier than the general run of humanity.
I suspect we will find that there are several genetic locations which relate to which gender one finds most attractive.