Impeaching a president is a really big deal that has huge consequences for the nation. So the framers wanted to make sure that impeaching the president could only be done when there was an overwhelmingly convincing reason to do so. Your best answer is the last one: the framers wanted to ensure that presidents were not removed from office unfairly.
Photosynthetic prokaryotes caused aerobic atmosphere during the history of Earth.
He refused to be commander of the Paris garrison. It was an offered to him by Robespierre but
he decline the offer because he felt there was danger to accepting it. Rather he
took a secret mission to Genoa and when he came back, Robespierre was eliminated
and he was arrested but released on the grounds of lack of evidence.