Along with Sajjan Kumar's acquital, the court also convicted five others for murder in the same judgement. Think about that, and then think about the logic of the first sentence again. Apply the logic you just used, with this fact in mind.
As somebody said earlier on the thread, people use different standards and different logic to evaluate their favoured people as opposed to their disfavoured people.
And by the way, hundreds (yes, HUNDREDS) of people have been convicted for the anti-sikh riots, to date. Several of them have been given life sentences.
442 convicted in various anti-Sikh riots cases: Delhi Police - Hindustan Times
Now think about how many have been convicted in the Guj riots? And apply the logic you used earlier.