So, as far as the infliction of punishment: "The Lord himself", by his fore-knowledge, "has scattered them." That is, he disperses Jews among nations. As Psalm 55:22 says: "Cast your burden on the Lord, and he will sustain you; he will never permit the righteous to be moved."
Thirdly, an irreverence for their elders was blamed on them (the Jews), and their enemies regarded such irreverence. As said: "No honor was shown to the priests, no favor to the elders." As Isaiah 3:5 says: "the youth will be insolent to the elder, and the base fellow to the honorable." Or these can be words of the prophet against enemies of the Jews.
Thirdly, an irreverence for their elders was blamed on them (the Jews), and their enemies regarded such irreverence. As said: "No honor was shown to the priests, no favor to the elders." As Isaiah 3:5 says: "the youth will be insolent to the elder, and the base fellow to the honorable." Or these can be words of the prophet against enemies of the Jews.
Source: Commentary on Lamentations