A: Why did Joe ground his daughter?

B: Against his better judgment, Joe let his daughter attend her friend’s party last week. The girl returned home after midnight, intoxicated.

Note: This idiom means “contrary to what one feels to be wise or sensible.” When people say they did something against their better judgment, they mean they shouldn’t have done it had they fully followed their head instead of their heart, so to speak. In other words, they more or less regret it now.