While he was mayor of Davao, Rodrigo Duterte tolerated the presence of rebel groups so long as they did not bear arms or carry out attacks in his city. It was an uneasy arrangement that was generally observed. After becoming president of the Philippines, the self-confessed socialist even appointed some leftist leaders to his cabinet.But this romance with the reds now seems to have unravelled as pressure mounts on the country’s remaining insurgent and terror groups. A controversial anti-terror…