Now this is how "honour killings" should be dealt with! But a couple things occur to me:
First, if I interpret the names correctly the couple and caste involved are all Hindu. "Honour" killings are not exclusively a Muslim issue. They are a problem that exists in tribal and clan-based societies, of which Islam is the most familiar to us in the West.
Secondly, given the interesting political and demographic issues in India, I wonder if the court would have had the courage to sentence 5 Muslims to death if it were a Muslim honour killing rather than a Hindu killing.