You are right bro. Justice has to be served. I dont think it will, considering how corrupt these people in power are, and how they will bury any atrocity, but hope one day justice will be served for this
That said, I dont think it was communally or religiously motivated, so it would be wrong to blame Hindus. Atleast I am not aware of any Hindu extremist group doing it. Infact people like Jagdish Tytler, who is a Christian (and had a Sikh mother!!! )is alleged to have been involved in the conspiracy. I think this was politically motivated revenge attacks. The only ones to blame here should be Congress and the problem really is that some of the politicians that may have been involved are very prominent ones.