You have that feeling because you haven't actually read the Bible. The historical books of the Old Testament, Joshua through Nehemiah, are full of stories of God using wicked and evil men to accomplish good things. For example, King Jehu, who reigned in the 9th century BCE, is an example of God using a wicked man for a good end. Anointed by a prophet sent by Elisha, Jehu was tasked with eradicating the idolatrous house of Ahab. He killed King Joram, Queen Jezebel, and all of Ahab's descendants, fulfilling Elijah's prophecy and eliminating Baal worship in Israel by deceiving and slaughtering Baal's prophets. Despite his zeal, Jehu continued in idolatry by maintaining the worship of golden calves, illustrating how God used his ruthless actions to achieve reform despite Jehu's own moral failings.