It is wiser being good than bad;请详细分析一下句子结构、成分!

完整的句子：Being good is wiser than (being) bad。It 做形式主语,代替being good。than conj。[用于形容词、副词的比较级之后]比；与…比较：She is taller than me。她比我高。Thomas arrived earlier than the others。托马斯比其他人早到。