Civil servants are career people, who have worked under multiple administrations and are covered by federal hiring/firing laws.
I agree, but they are, like political appointees, integral to the functioning of government. If they can't ensure the proper functioning of the government because they disagree with the administration, they should be fired. Respectfully.
The president swears an oath to protect and defend the Constitution, and to see to it the laws be faithfully executed.
Civil servants and political appointees alike swear loyalty to the Constitution. The former are the crown jewel of a Republic, governed by laws, not by men. They are what stands between your Dear Leader and a bunch of goons, picking you up at night, and feeding you into a meat grinder to be sold as sausages the next day at the behest of the Dear Leader. No right is safe if the Dear Leader gains complete control over the civil service. If the president has a political agenda he wishes everyone follow, he has a path to do that: Go to Congress, and ask for the laws to be changed, and, once that is done, to be followed and implemented by civil servants. Simply to order the civil service not to follow the laws and regulations is not an option the president has, and neither should he.
You are arguing as if the U.S. of A. were Trump's personal property, to be dealt with according to your Dear Leader's will. That's not a Republic. If what you outline is your predilection, go move to Saudi Arabia or North Korea.
Trumpletons, every last one of them, slept soundly during every - EVERY - civics class. And that's why no information on how a Republic is supposed to work gets into the way of their Fuehrer Cult.