he was particularly keen to present a view that it was a homophobic hate crime ...that just happened to be committed by a Muslim.
And this was incorrect. It wasn't a homophobic attack for the sake of being a homophobic attack.
It was a TERRORIST attack in the name of Islam -which prohibits anal sex and depending on your point of view is either a homophobic religion or a non-accepting religion.
The Quran deals explicitly with Sodomy (Liwat, named after Lot and his people). The holy book recounts the story of Sodom several times, condemning its people’s overall immorality, and specifically criticizing its men for “going to men out of desire instead of to women.” Sodomy, understood as anal sex, was thus prohibited by the consensus of Muslim scholars (Muhammad’s condemnation of anal sex with wives added hetero anal sex to this as well). Muslim scholars set the punishment for anal sex between men as anywhere from a relatively light one at the judge’s discretion (since Sodomy could not result in illegitimate children), to the same punishment as fornication (based on analogy to hetero-sex), to execution (based on a command from Muhammad of disputed authenticity).
variety.com/2015/voices/opinion/islam-gay-marriage-beliefs-muslim-religion-1201531047/
For him to be all "this is just about LGBT" was wrong and missed the point. The big point is that it was an attack on gay people carried out in the name of ISIS and Islam.
He lost credibility by walking out. It is very toys out the pram.