Given the choice, most people prefer a comforting lie over a difficult truth. Nowhere is this seen more clearly than with the LGBT issue of the modern world. Disagreement with LGBT behavior is seen as intolerant, bigoted, and hateful. Because, you know, why wouldn't I want people to put their health at risk just for sexual pleasure?
But worse than the physical effects of sexual immorality is the eternal effect: The second death. Complete separation from God, the giver of life. Now, which seems more loving? To tell people it's totally fine, even something to be proud of, to degrade their bodies with each other, or to warn them that their actions have consequences, hopefully convincing them to avoid those consequences?
The Bible says the wounds of a friend are greater than the kisses of an enemy (Proverbs 27:6). In other words, a true friend isn't someone who always tells you what you want to hear, but also what you don't want to hear. LGBT activists don't want to hear that Hell is real, and homosexuality is a contributing factor to who goes there, but they would hate actually going to Hell even more. If you love a gay person, it's far better to tell them the dangers of their behavior than it is to agree with them and let them face those dangers.
Speaking as an ex-gay, Heaven is certainly more appealing to me than a fake marriage to another man. Even if humans were so powerful that I could expect to live 10,000 years, being gay for every day of it, that wouldn't be worth going to Hell for. It is far more offensive to me that there are people out there who insist that I was robbed of a good thing than even genuine homophobia. At least Westboro Baptist Church has the guts to admit they hate gays and want them to go to Hell, but Liberals want me to believe that if I truly love gay people, I should prefer them to live a miserable eternity over a not-so-miserable life? There is nothing in this world more homophobic than Left wing politics.