It appears that some of the details about the motivation behind the violent beheading of Pasikali Kashusbe and his connection to LGBT rights group Integrity Uganda are still very much in question. A story that some connected to the beheading, the apparent disappearance of a Rev. Henry Kayizzi Nsubuga after what was reported to be a "pro-gay sermon", does indeed seem to be a hoax. I didn't include that side story in the original post for exactly that reason- it seemed odd and hard to corroborate. You can get the background on that story and how it is unfolding over at Box Turtle Bulletin, who is doing great work on the subject.
The actual beheading is not being called into question, just the motivations behind it. Some think it may be more of a ritualistic killing than an anti-gay hate crime, yet details remain sketchy. The violent genital mutilation and beheading could indicate both causes: a ritualistic murder or an anti-gay based crime of anger.
What isn't in question is the violent rhetoric that has been circulating in Uganda, much of it by American Evangelicals who travel to the country to say things and promote dangerous agendas they don't dare admit to in the United States. The danger to LGBT people in Uganda is very real and ever increasing. Beatings, death threats, jail sentences, and yes, even murder, are not uncommon in the country or in other African nations.