Did you sleep through the entire primary season in 2016? The culture has been degraded so as to be unrecognizable from just a few years ago. The name calling, the lies, insults that continue from the white house are at the root of this debacle. Complain all you want but be honest about the genesis of her taunting of the president. As for Sarah, how she lives with herself is beyond me. Two small children that will grow up knowing their mother defended the indefensible.
She does it for the paycheck. She got the job as a nepotism favor after her dad kissed up to Trump early and often. Which probably means she doesn't have a lot of good job prospects otherwise. You do what you have to do.
Besides, the job is White House Press Secretary, the most undignified job in Washington. Can you think of one such person in that position that has had one shred of respect? MAYBE Tony Snow. It is a darn near impossible job if you want to keep your self-respect.
If I ever got offered that gig (and at the rate the administration is going through staffers I just might) I'm using a pseudonym. (Preferably something ridiculous so that the reporters have to refer to me as, for example, "Turd Ferguson" —alas, that one is taken).