Why police misbehaved with Delhi doctors during strike?

Doctors of many government hospitals are on strike for the last 12 days in Delhi. During the strike, the first clash between the police and the doctor took place near ITO and then a large number of doctors from Safdarjung Hospital also stood for the protest. According to the doctors, they were marching towards the house of the Union Health Minister to protest but Delhi Police stopped them midway and misbehaved. Watch this video.