Vice President Jagdeep Dhankhar criticised some NGOs over their alleged silence on Kolkata's RG Kar rape-murder case. "Certain NGOs who are on road for drop of an incident...but they are in silence mode. We've to question them. Their silence is much worse than culpable act of perpetrators," Dhankhar added. Dhankhar made the remark during an event at AIIMS Rishikesh.