I have the impression that this young man, apart from belonging to that cult of the rainbow children that I can imagine drank alcohol, consumed drugs and had unbridled sex without protection... this young man was homosexual... the swastika can give that information... that hatred against the gay community leads them to kill them just for being gay... I think they waited for him somewhere, kidnapped him with his car, perhaps he was raped by these same guys and killed, leaving the swastika as proof of his actions... I also read that he wanted to get his life back and continue studying... he was never able to do so...
whatever the case
rest in peace