The answer is that liberals are not only drawn to the issue like salmon to their home stream, but that they’re afraid to leave it be. But not for the reason you think. Indeed, they couldn't care less about the hurt feelings of the sexually confused.
What they’re targeting is the mindset of those men who aren’t at all confused. After all, you have to remember that their goal has always been a state of being which doesn’t admit any identity for oneself other than that provided by the government...It always comes back to this, that the Left wants to substitute the State, with themselves in control of the State, for God. The State is not all powerful, but He is. Just as Obamacare has been a disaster, in that we still have 30 million people without insurance, and insurance rates are rising faster than the did before Obamacare for those that do have it, so Bernie will not be able to deliver on his promises of free stuff. Someone has to pay, and there aren't enough billionaires and millionaires to soak to pay for this his free stuff. As Margaret Thatcher said, "The problem with socialism is that eventually you run out of other peoples money." No, the Left is not God, and they can not give you what God can, and they know this. That is why they work so hard to keep Christianity out of the public square, and why they are so enamored of Islam.
Read the whole thing at the link. It isn't long, and it will tell you everything you need to know about the issue, and every other issue too.