In this passage, God commands the Israelites to completely destroy the nations that He delivers into their hands. The instruction is not merely about physical conquest but about spiritual fidelity. The surrounding nations worshipped other gods, and God knew that if the Israelites allowed these influences to persist, they would be tempted to stray from their covenant relationship with Him. The command to not look on them with pity underscores the seriousness of avoiding idolatry, which was seen as a direct threat to their faithfulness. This was a call to protect their community from spiritual corruption and to ensure that their worship remained pure and undivided.
For modern readers, this passage serves as a metaphorical warning against allowing influences that could lead one away from their faith. It highlights the importance of discernment and commitment to one's spiritual path. While the historical context involved physical nations and deities, the underlying principle is about safeguarding one's heart and mind from anything that could become a 'snare' or distraction from a faithful life dedicated to God.