If the treatment of people in LGBT lifestyle is to focus on their sin, no matter how right it is it doesn't change anything. If it doesn't change anything, than the purpose of focusing on their sin is probably not about helping them, but about protecting ourselves and distancing ourselves from them.
People overcome by focusing on God and his goodness, not on themselves and their badness. So if we can't help them focus on God then we do not know enough to help them and need to focus more on God ourselves, until God gives us love for them.
Loveless truth is not from God, but from religious spirits. If we are in touch with God's heart then we know how to speak a truth to someone that brings them into God's love. God's love is a greater truth. If we don't know how to step into their situation and see God's heart from there, how can we say we would overcome that sin if we were tempted by it? If not, how can we have authority to talk about it... especially if without God's heart, nothing we say has the power to change anything? In that case our words become a result of disconnection from God, just like their choices.