Or, just for giggles, we could acknowledge that the weapons (guns) used are merely the tools used in this tragic incident and not a one of them pulled their own trigger. Since everyone loves analyzing things, let's ponder why an apparently successful 64 year old man with no criminal history became so enraged that he opened fire on a crowd of strangers and then killed himself. Instead of focusing on the method, a new approach might be to focus on the motivation.