Calvinists will say with a straight face that God is Just and Merciful while believing that God arbitrarily selects some people for salvation and damnation based on nothing they have done and will just torture most people forever despite that being definitionally arbitrary and cruel

Calvinism is terminal stage rules lawyering and powergaming all for the sake of making the rich and powerful feel righteous by default and leaving no room for good deeds, good works, or love in their calculations.