It's wildly undemocratic to push for government employees to usurp the will of the people's representatives.
Like other's have said, the best a government employee can do to protest the direction that the President and Congress set is to resign vocally (as lots of people have done).
Consider the opposite side! People rightly criticize government employees who resist implementing gay rights. But, somehow EPA employees resisting loosening regulations is righteous.
Everyone thinks their political beliefs are righteous.