If LGBTQ doesn’t violate any moral principle but is in fact a moral issue, then denying LGBTQ its expression is immoral because it prevents us from a full experience of life. This must also be a sin because in denying a full experience of life, we have a diminished understanding of ourselves. A sin because we are icons of God and understanding ourselves is our only means of understanding God.
That’s as straight as it gets!
Rambling Thoughts 