Well Trump can say whatever he wants, whether he actually can do what he says is another matter. In this case for example, congestion pricing has simply continued as before because Trump doesn't have power to change the laws of New York. When it comes to killing people, government employees are subject to the same rules as everyone else about unlawful killing, even if they were ordered by the president. Of course Trump can pardon his assassins for federal crimes, but states can still prosecute them and if nothing else the victims can still use deadly force to defend themselves without being guilty of a crime.
So legally speaking, Trump isn't so much a king as just some fat, old, possibly mentally-challenged man who can't be punished for things.
But in the technical sense, we're all kings and can do whatever we want. We've just agreed as a society that if people do certain things we all unite to help put them in a cage or whatever.
I can totally believe that someone who's never worked in the private sector has such a fanciful view of how layoffs work. My first job out of college was in the government. My views of what constituted "waste" were hilarious, like we got a flashlight (because we occasionally would go outside at night) and it was definitely a pricier flashlight, with some features we didn't really need. I told my friends at home, "Gosh, the government is so wasteful, look at this overpriced flashlight I got". Of course they made me turn it in when I left, but still.
Then when I got into the private sector I realized private sector waste is a whole different animal. Obviously there's the insane CEO pay packages, but that's just the tip of the iceberg. Definitely I've seen some multi-million-dollar projects that never should have happened and were just the result of our slick salespeople. When I left one job in a layoff I had no way of returning a $3000 laptop because the person I'd return it to was laid off too. It ended up being a nice gift for an amoral friend. Of course layoffs themselves are crazy wasteful, you have tons of hard-earned knowledge walking out the door. They're almost always random and driven by a desire to temporarily boost the stock price as clueless shareholders are left holding the bag when the company collapses a few years later.
Point is government waste exists, but it's like a leaky faucet that drips a little. In the private sector, it's like a faucet that's constantly running on full blast because everyone is incentivized to maximize the rate of flow.