The Shepard murder looks to be another sickening case of the media creating its own reality (maybe because they figure it "sounds" so much better than the truth, IDK). Those guys were known to be friends and fellow meth addicts, fellow wannabe dealers, who'd shared some history.
Since you neglected to provide a source for this theory, I looked for one. This is what I found:
"Stephen Jimenez, who has spent 13 years interviewing more than 100 people with a connection to the case. His conclusion, outlined in The Book of Matt: Hidden Truths about the Murder of Matthew Shepard, is that the grotesque murder was not a hate crime, but could instead be blamed on crystal meth, a drug that was flooding Denver and the surrounding area at the time of Matthew’s death.
This new theory has, understandably, caused a lot of anger."
Whether it is true or not, cannot be proved. It is a possibility though. There is usually more to a story than we know. One part I found interesting was where a retired office Waters said, "Some of the officers I worked with had caught him (Henderson) in a sexual act with another man, so it didn’t fit – none of that made any sense.” Does anyone believe every G4P person is gay? Many if not most prostitutes go with whoever will pay the price and do whatever the client wants.