1) Raid on the Golden Temple is an unfortunate incident and GOI officially apologized for that incident.
2) Every religion has radicals with some degree of conservatism, the whole game of political game went wrong in the Golden temple incident, it is not a single incident. Some series of events lead to this, Every one including GOI is at fault.
3) I would say a conservative leader who do not fit into democratic setup.
4) Not at all, violence cannot be justified, I hope the trial will go well and justice will be given to the victims.