It's because he killed their fake political consulting businesses and their constant arm deals from the never-ending neocon warmongering, regime changing and adventurism.
Simple answer,
President Trump showed the American people that the USA can be the most powerful country in the world when the government steps back,promotes peace and gives power back to it’s people.
The powers that be are scared sh—less of us and are doing whatever they can to take the concept of self determination and liberty down..in the process they are digging graves for us all.