Why Were Women Subjected to "Tests" for Suspected Adultery?

Why should an innocent wife go through all this because of a suspicious husband (Numbers 5:14-31)?

This would be for her own protection. This test actually functioned as a protective measure for a woman falsely accused of having an affair. Without it, the furious husband might harm her–even kill her. The law served as a deterrent against private acts of vengeance and retribution, and ensured justice in a potentially explosive situation.

–The Quest Study Bible