It's a learned bigoted reaction that can be unlearned.
It's a natural reaction.
Not enough is known about it to explain it.
Other (please elaborate)
BBC News | Americas | Americans mourn gay hate-crime victim
The National Center for Victims of Crime - Library/Document Viewer
Some Gay Hate Crimes Ignored - ABC News
According to many Christians' interpretations of the Bible, killings gays is in fact sanctioned by their god. It may not be as organized here as it is in some places, but it certainly happens. Every day. It is so common I've even seen it myself. There was a gay kid at my high school who was dragged into the field and beaten so badly he spent 2 weeks in the hospital.
Christians absolutely beat and kill gays. Say it's wrong if you like, but if you simply pretend it isn't happening, you're no better than the Muslim extremists you hate.
They say "gays don't exist."
You say "we don't kill gays in America."
Both are self-delusion.
I found this, but nothing related to anything at all in your post.
In 2006, 1,393 hate and bias incidents against lesbian, gay, bisexual, or transgender (LGBT) victims were reported to the National Coalition of Anti-Violence Programs. These incidents affected 1,672 victims, committed by 2,365 offenders. (New York: National Coalition of Anti-Violence Program, 2007.
CORPORATE GREED AND UNION GREEDDEMOCRATS AND REPUBLICANSDESTROYING THE BEST OF AMERICA ONE DAY AT A TIME
This is the worst kind of discrimination. The kind against ME! ~ Bender