I'm sorry, but I think this has to be said. I understand the speculation about what happened that night, trust me, I have a lot of questions as well. However, I would suggest that everyone be very careful about even suggesting or hinting at possible conspiracies or involvement of anyone not officially identified by LE as a suspect, even in speculation.
I guess if you have never been known or been close to people that have been involved in a heinous crime before it is fairly easy to ask why would someone support the accused, etc. However, you are looking at a very close knit group of friends who would have spent an amazing amount of time together and believed they knew each other better than siblings living in the same house would have known each other. Police have not released any evidence, not even an official cause of death, that would provide any of this group of friends with 'proof' that their good friend was involved in the death of their other good friend, whom they knew to be very much in love. Of course they are defending him, and standing by him, they believe this is a horrible injustice, and there is no way the police have the right man.
I believe that if the police were to release the things that are being talked about as 'official', you might just find some of those people not so adamant in their defense of their friend. But until he has had due process, and the evidence is put out there, you can't condemn people who are already reeling from losing one close friend for not believing the worst of a second without pretty convincing proof, not just rumour.