http://revach.net/article.php?id=2596

Section: Tanach   Category: Eichah
Rav Chaim Kanievsky on Eicha - We Are Orphans Without A Father

A child who has a father but doesn't ask his advise is for all practical purposes an orphan since his actions and decisions are taken without any paternal influence. His advantage over a real orphan is that if he should wisen up he still has somewhere to turn. Not so a an orphan without a father.

Before the destruction of the Bais HaMikdash there was an Urim V'Tumim to ask our questions to. Unfortunately we didn't bother asking and just did as we pleased. After the Churban the Urim V'Tumim was taken away from us and we had no one to turn to.

This is pshat in the pasuk (5:3) says Rav Chaim Kanievsky "Yesomim Hayinu V'Ein Av". Before the Churban we were Yesomim although we had a father to ask; the Urim V'Tumim. Now that it has been taken away we are orphans without a father and are bereft of any possible fatherly advice.