No one knows who killed him. Those defending HA at best came close to shaking the hand of the driver of a HA MP and therefore don't know anything about the party and those blaming HA are jumping the gun and have no facts to base their conclusions on.
Truth be told if it was a Mossad hit, it's a more condemning news to HA than it being a simple assassination against a dissenter something that's sadly not surprising in the ME. It is more condemning because it didn't happen in Cyprus or London or Asia, it happened in South of Lebanon, a HA stronghold.