How valid are celebrations over Hyderabad encounter?

Hundreds of people who gathered at Chatanpally hailed Cyberabad Police, especially its commissioner V.C. Sajjanar for killing the perpetrators of the heinous crime.  As the news of the killings spread, people at various places in Hyderabad and other parts of Telangana gathered to hail the police. Some of them burst firecrackers and distributed sweets.