Federal judges can only be removed from the bench for misconduct, not for rendering bad decisions. We have appeals courts to review lower court rulings. To remove a Federal judge, you do it the same way you remove the President. The House votes Articles of Impeachment setting forth the "high crimes or misdemeanors" alleged, and then a trial is held before the Senate, with a 2/3 majority needed to remove the judge from the bench.
The guys who founded the country believed in an independent judiciary. One that couldn't be swayed by popular opinion and would follow the law without fear of losing the next election, or being fired by the President if they didn't rule his way on a particular case. They were pretty smart guys, I hear.
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