SAN FRANCISCO—The arraignment of a man who allegedly stabbed two older women without warning at a San Francisco bus stop was postponed Friday after he refused to leave his jail cell and appear in court. Patrick Thompson’s arraignment on charges of attempted murder, assault with a deadly weapon, and elder abuse was postponed until Monday. District Attorney Chesa Boudin asked that Thompson, 54, be held without bail, and Judge Brian Ferrall agreed. Thompson, who has a history of mental illness, could face a potential life sentence if convicted. San Francisco public defender Eric Fleischaker is representing Thompson and said the attack was not racially motivated and that his client has suffered mental health issues his entire adult life. “We do know that Mr. Thompson was suffering from a mental health crisis and was psychiatrically hospitalized immediately after this incident,” Fleischaker said Thompson thrived for nearly two years while on a …