Why are Christians obsessed with Gay people?

[Divinity]

Here's something I don't get.

You kill 6 million people, and you get sent to hell for eternity if you don't repent.
You have a monogamous relationship with someone of the same sex, and you get sent to hell for eternity if you don't repent.

As my daughter pointed out--this is fucking disproportionate retribution. So... why shouldn't gay people go around killing people? I mean they might could make their lives better here on earth. They have no intention of repenting. They're going to hell for eternity anyways. Might as well sin as much as they like.