At Shabbat services the rabbi noted that "Eikha," alas, woe is me, can also be read, with different vowels, as "Ayekah"--where are you? We accept God's rebuke, but God will only hear that question if we shift our emphasis a bit.
Here's a great post about this holiday and the most recent reason we as Jews must ask for God's patience and forgiveness:
What Tisha B’Av Can Teach Us About AgriProcessors
And two others that try to explain the difficult verse I'm about to chant and still don't undertand:
To Prey or to Pray? The Lessons of Famine on Tisha B’Av
Why Will You Cry?
Wishing us all a day of hearing God, being honest with ourselves, looking out for each others' welfare, and striving to learn from our mistakes.