He’s a Sikh. Apparently there is a battle raging among Sikhs over this a**hole, some condemning him as a criminal and others taking the ethnic solidarity route.
His parents are Sikhs, but I note he has his hair cut! I don’t think you can be a male Sikh in good standing with your hair cut. So based on photographic evidence I’d say he was of Sikh ancestry, but isn’t a Sikh himself. Thus I wouldn’t blame the, normally good, Sikh community for his actions.