By Christina MoralesJill Cowan and Neil VigdorJill Cowan reported from San Diego.Thursday May 21, 2026 Each morning, Amin Abdullah made the same careful rounds before heading across town to his day job as a security guard at the Islamic Center of San Diego. He would arrive at a small, aging mosque, walk its edges with a flashlight and check every dark corner, said his friend Khalid Alexander. Then he would step inside to pray. For Mr. Abdullah, a Muslim convert, the work was more than a paycheck. It was a duty he felt…