There was an ongoing campaign by many people including ex-soldiers for their release. He both shows dominance with this and also tries to calm down the
Erdogan has released a number of people convicted in plotting the coup in the February 28 case.
Maybe the MHP forced his hand. I don't believe the reason that they had health problems, as others were left to die. I think this is the most likely case, he must have swallowed a lot of pride.
At the same time, the Kobane case. I wonder if there will be repercussions by ECHR again.
ex-military men. This comes in a time where Selahattin Demirtas (APO the Second) was given 42 years of prison. I think Erdogan is showing gestures of reconciliation with some influential actors in the State after the weak results in the election and the coming end of his political career. A certain atmosphere is created including the rebalance in circles connected to the organized crime.