Why is bad behavior not always punished?

Good behavior is not always rewarded and bad behavior is not always punished because sin has twisted justice and made our world unpredictable and ugly. For example, Job suffered for no apparent fault of his own. The world is like that. But, then, we find faith is justified when all looks hopeless. Besides, faith based on rewards or prosperity is hollow. Faith must be built on the confidence that God's ultimate purpose will come to pass. Job had a perspective that was greater than his own personal comfort. Calamaties may even mock your caution. The worth and meaning of life are not based on what we feel but on the God's love for us which can never be taken away.

"For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come, Nor height, nor depth, nor any other creature, shall be able to separate us from the love of God, which is in Christ Jesus our Lord" (Rom. 8.38,39).

God has promised to destroy all evil eventually. In the meantime, any suffering we endure will strengthen us and glorify Him.