We should not underestimate the terrorists' guerilla tactics and make-shift weapons.
@DBdev
To your logic, every major defence company has been outsmarted by some kind of militia/guerilla/terror group etc. (See Houthis for example)
This is warfare. You learn as you experience shortcomings and...
It is worth to mention that KOC has been a champion of most tax payments multiple times over the years, even after Gezi and their clear dispute with the government they were still the highest tax payers in the country.