There was government involved. Maya Kodnani, who was a part of the BJP government at that time (2001) and later on made the Minister for Women and Child Development (in 2007) in Gujarat was convicted of murder and conspiracy to commit murder.
Looks like you deleted your parent post. To provide for future readers, the parent post claimed that the Government was not involved with the riots at all. My reply provides an example of a Minister of the Government who was convicted for murder and conspiracy to murder in a case involving the riots.