He's just a junkie. Those are the words that enabled bad cops to not do that detective work that was necessary to find the killer back then and still today. Hes a junkie. It's so typical. It had to happen eventually, etc.
Meanwhile, here are the facts. The door was not barricaded. The shell casing was on the wrong side of the gun. The gun was at an impossible angle. The heroin in his system was so great that handling a gun would be impossible. The former Seattle police chief ADMITTED they botched the case and that it should be reopened. The suicide note was found to have entire pieces traced from Cobain's own notes, AND Love claimed the suicide note was found under her pillow the day Cobain died even though her PI checked under her pillow the night before, found nothing and Cobain had been dead for a week already. Furthermore, Cobain leading up to this event had appeared to many to be more or less getting his life together, and had planned to divorce Love according to several reports from close friends. That means she stood to lose a lot of money and fame. Watched Soaked in Bleach, the things she said to the PI expose what she was really worried about when Kurt went missing.