Unless you're a mind reader, no one, not even Trump can know what is in a person's heart and soul when you hire them, or whether threats, or money will motivate them to turn on you. A long time ago, Trump said that eventually, someone who claimed you could trust them, will turn on you. Trump gave a lot of people the opportunity to work with him. There's no telling who will, and won't stab you in the back. Ask Scooter Libby about that.
Trump is a high-profile person, has been for a very long time. A lot of other people worked for him in his real estate business, his golf courses, etc. How many times have you read of any of them feeding smut to the press, or complaining about him? I don't remember any of his regular employees making outrageous allegations about the man since he announced his run for President in 2015. Michael Cohen wasn't an employee. He was a corrupt lawyer who lied on his tax returns and bank loan applications. The people who turned on him are the political animals that make up Washington politics. They obviously have no core values or integrity to begin with, but you can't see that on the outside of a person or find it in a job interview, but it will eventually show itself. And Trump didn't hire all of the people that worked for him. That's what he had a Chief of Staff for. They interviewed a lot of these people themselves, and made recommendations to him.
You have no idea what kind of pressures were put on the people who turned on Trump, or the motivations that helped them make that decision. Unless you live and work among the slugs in the deep state, you have no idea what goes on behind the scenes. So don't blame it all on Trump. Democrats were planning on impeaching him before he was even inaugurated, so it's likely, they helped some of his people to turn on him like a rabid dog. Unfortunately, some people can be easily bought. and a majority of them live and work in D.C.
Yeah. 4 decades of people working with Trump saying he’s a corrupt a$$hole, nothing to see here.