Because violating the Constitution (22nd Amendment) is just another day in crazyville:
President Trump’s tweeting of a “Trump 2024” meme should concentrate the minds of his opponents. So should the results of North Carolina’s special congressional election Tuesday.
Perhaps it’s a mistake to take the first too seriously. But it does underscore the utterly abnormal, chaotic, norm-breaking and corrupt nature of this administration. We have a leader who, like some of his dictator friends abroad, would love to be president for life.
I'm actually much more worried about what he and his rabid followers will try to do when he loses the 2020 Election. He may have to be (physically) removed from the White House in January 2021, but even if he rides off into the sunset on his golf cart, there will be some violent confrontations as a result. Here's more from EJ Dionne:
Combined with a spate of new polls showing Trump’s disapproval ratings in the 55- to 57-percent range, such an outcome would have created Democratic “Trump is toast” euphoria. And it could have sparked a panic among Republicans about the costs of allying with a president who plays fast and loose with intelligence, seems to profit personally from Defense Department outlays and encourages reprimands of scientists who simply want to tell the truth.
Instead, we have learned from North Carolina and the new polls that: (1) divisions between rural and metropolitan voters are deepening; (2) Republicans will have great trouble winning any suburban-dominated district, which will make it very hard to win back the House; (3) the vast majority of incumbent House Republicans represent very pro-Trump seats and have no political interest in breaking with him; (4) life will stay complicated for vulnerable Republican senators up for reelection in swing states because they need turnout from voters turned on by Trump but also suburban crossover voters turned off by Trump; (5) division, distraction and fear will always be Trump’s play; and (6) a large majority of the American electorate would like to throw Trump out of the White House, but Democrats will have to make it easy for them to do so. There will be no miraculous solution to the Trump problem.
Bolding mine, because that's a nice way of saying, "Be careful who you choose as your Nominee."