I actually see that Guest01 has already done a good job of answering your questions. However i fail to understand what exactly is your point? No one here condones the 1984 riots or believes that justice was done. That however is a separate issue and the logical corollary to those raking it up in this context is whether a commutation of sentence in this case would mean that Sikhs (And all other Indians) will forget about the 1984 riots? Can't have it both ways; first say that this man must be freed/sentence commuted because justice has not been done in he 1984 riots & then turn around & still ask for justice in the 1984 riots. Either your stand has to be on a firm footing or you give up claims along with your demands.
My position has been straightforward, I support the rule of the law, whether it is for those involved in the 1984 riots or those terrorists who have been found guilty of terrorism. I have, in my posts condemned those Hindu groups who are involved in terrorism, condemned Muslim groups who are involved similarly, have held both the congress government of 1984 & the BJP government in Gujarat in 2002 responsible for what transpired there I believe that is a fairly consistent line that I have taken. You may not like my position but you will never be able to find a single post where I have said differently from what I say here.
Funny that you didn't ask why the Sikhs of Punjab voted in a Congress government whose Chief minister some claim now to be involved in killing ( no proof provided of course). Don't turn this into Sikhs versus the rest .All Indians felt the pain of what happened in Punjab in those days which is why you see almost mo sign of any tension between Sikhs & others anywhere in India. Granted that the pain will be felt the most by those who were directly involved, not necessarily fair to equate that with this case. Unfortunately as happened with the Sri Lanka issue, this seems to be an easy, cynical way out.