Nothing is perfect.
There are, as they say, horses for courses. Johnny Turk had a very good understanding of the psychology and the bravado/cowardice formula of his Arab subjects.
Instead of a multi-trillion dollar waste in Mesopotamia with 40 000 invaluable young men dead or maimed, the Sultan would have taken a few heads, with a few more sets of testicles plus several thousand attractive women and had no worries for 75-100 years. Rinse and repeat.
except these days you have Erdogan and his ilk who have armed this ISIS lot over the border for the last year with truck loads of weapons....