For Vinnie Walsh, 82, of Auburn, Mass., it was “the whole nine yards — the loss of decency, courtesy, compassion, democracy.” Laurae Carpenetti, 54, a physician from the Atlanta suburbs, said that Mr. Trump’s appointment of Robert F. Kennedy Jr. as his top health official was her motivating factor.

The LAPD and other agencies are aggressively clearing the streets of downtown LA, where protestors had pushed up against police lines.