Turkey has had four successful coups since it became a NATO member and none of them led to expulsion. Portugal and Greece were also dictatorships when they joined. The prospect of Islamism might be a good reason to doubt their membership but not authoritarianism.
I would have said no a few months ago but it looks like after the Russia/Israel rapproachment they might now be breaking their links with Hamas and Al Nusra
Apparently his city is by far the country's safest. So death squads do work it would seem. The issue is whether the ends justify the means or if some actions are just wrong regardless.