You're unclear as to what you mean. Riots are justice? Or was the execution justice?
If it's the latter, then I agree with you (although I take no pleasure in it). If it was the former, I could not disagree with you more.
BTW, you may want to take a peek at #356 in this thread. That's where your comment should be aimed.
Why would I say riots are justice?
C'mon rdb3.