Would you compromise your principles?

Recently, I have been faced with a dilemma.
Before I tell you what decision I took, I will ask you.
To what extent would you as a human and a person who works in the corporate world go to save your job? or to protect your future investment in the company - e.g promotion, going up the corporate ladder??

Do you think that going against your principles and ethics, and gaining the achievement in the end is worth the while?