@Data-Dog
You are right ,most JWs are not homophobic. And from my experience many accept that it is part of imperfection, i.e. nature or nature/nurture combo. So I don't really see why you need to try that argument with them because as you say, as with any other imperfection, God is allowing it. The imperfection that is. How a person acts on it is what matters to God. As for judging people who live that life style, it is up to God to judge them. However when a JW unrepentantly practices that life style, they will be disfellowshipped, just like a person who practices any other lifestyle condemned by God, as per 1 Cor 6:9.
I know you are alluding to the GB being homophobic, in reference perhaps to the infamous "tight pants" remark. But whatever the case may be, no WT literature nor the website gives that impression. This from the website "the Bibles answer": ....."While the Bible disapproves of homosexual acts, it does not condone hatred of homosexuals or homophobia. Instead, Christians are directed to “respect everyone.”—1 Peter 2:17, Good News Translation. Can a person be born homosexual?The Bible doesn’t comment directly on the biology of homosexual desires, though it acknowledges that we are all born with a tendency to go against what God commands. (Romans 7:21-25) Rather than focus on the cause of homosexual desires, however, the Bible prohibits homosexual acts". etc..
http://www.jw.org/en/bible-teachings/questions/bible-about-homosexuality/#?insight[search_id]=e10b2506-96bb-45f8-8155-6df95d7d2769&insight[search_result_index]=0