Even in the darkest moments of crisis, the Israelites are never entirely abandoned. God's constant watchfulness and the enduring kindness of their ancestors stand by them, preventing their total destruction. God acts with profound grace and mercy toward the people [מצודת ציון, ביאור שטיינזלץ, מלבי״ם]. He turns His attention to them specifically because of the merit of their forefathers [מלבי״ם], as the ancient covenant made with those ancestors is eternal and unbroken [חומת אנך].
Because of this unbreakable bond, God refuses to bring about their absolute ruin [מצודת ציון, ביאור שטיינזלץ]. The hardships and punishments the Israelites suffer are not signs that God has hidden His face or forsaken them. Instead, these difficulties are acts of divine guidance intended to wake them up and encourage them to repent. Yet, whenever God sees that the people are on the brink of total collapse, He steps in to save them from complete defeat [מלבי״ם, ביאור שטיינזלץ].
This divine protection is an ongoing reality. The assurance that God has protected them up to the present moment is not just a historical detail about the past, but an eternal promise. Every person who learns of this ongoing protection, in any generation, can apply it to their own time, recognizing that God's mercy continues to sustain them until their own present day [מצודת דוד].