1. Perhaps. Nonetheless, there is nothing wrong with evangelizing to others.
2. Lust is a corrupted form of Love. Love, not lust, is what truly allows relationships to florish in all areas. If one is desiring another only for their body, that is putrid, defiling sin.
3. Morality should apply to all, not just a certain few.
4. It's better to kill evil at it's roots, so it doesn't grow into an uncontrollable monstrosity.