Because he's a firehose of bullshit (gish gallop) and projection supported by a documented surge of foreign troll/bot farms helping plant and reinforce disinformation. As planned through years of gop attacking basic access to education, health care and a livable wage... the American people are either not equipped or don't have the energy to deal with that - especially from the position of a president or candidate even - we're trained to need a national father that will protect us if we get over our skis, so we are intimidated by the idea of fully opposing the office and the process, which is why we allow a convicted felon, compulsive liar to stand on stage as some sort of peer with a serving president.