ISTANBUL — As the war in Syria rages next door, Turks have grown increasingly weary of nearly daily reports of troubles at home: Iranian spies working with Kurdish insurgents, soldiers ambushed and killed, millions spent caring for a flood of refugees, lost trade and havoc in border villages.

“This is how we start our morning,” Mehment Krasuleymanoglu, a bookseller in a narrow alley in central Istanbul, said recently as he laid out several newspapers, each with a blaring headline about an explosion at a munitions depot that killed more than two dozen soldiers. The government called it an accident, but in the current environment, many Turks, including Mr. Krasuleymanoglu, are not so sure.

“What do we have to do with Syria?” he said. “The prime minister and his wife used to go there for tea and coffee.”

The Turkish government is facing a spasm of reproach from its own people over its policy of supporting Syria’s uprising; hosting fighters in the south, opposition figures in Istanbul and refugees on the border; and helping to ferry arms to the opposition. While many Turks at first supported the policy as a stand for democracy and change, many now believe that it is leading to instability at home, undermining Turkey’s own economy and security.