Thousands of people carrying banners deploring injustice, intolerance and Donald Trump marched through San Francisco on Monday in the annual celebration of the Rev. Martin Luther King Jr.’s birthday. The 14-block roundabout procession from the Caltrain station to Yerba Buena Center drew a joyous and boisterous bunch of people who linked arms, chanted slogans, sang verse after verse of “We Shall Overcome” and waved sympathetically at motorists stuck on cross streets. The presidential inauguration on Friday seemed to boost both the crowd’s numbers and its fervor. Many in the crowd said they were outraged at Trump’s Twitter blasts at civil rights legend Rep.