Yasin Malik Life Imprisonment: Why didn't court consider the case 'rarest of rare'?

Sepratist leader Yasin Malik has been given life-imprisonment in two different cases of terror funding. The judgment was pronounced by a special court in Delhi. Apart from this, Malik will have to pay a hefty fine of Rs 10 lakh as well. 

But the question is why the case was not considered rarest of rare and why didn't the court award him death penalty?