The Jannissari Ottoman institution kept the peace among Christians and Muslims of the empire because they had unique connections with both faiths. The sultans trusted them for their own personal security and in battle.
The greatest contribution of Sinan the Jannissari was as a builder of bridges and mosques. This master builder and friend of Suleiman without any doubt had a civilising influence on the emperor.
Today's Christians and Muslims must rebuild the Mostar Bridge in good faith. An appropriate name for it would be 'the bridge of master Sinan'.