[verum ago]

The people of Tangipahoa Parish knew Hurricane Isaac was on its way and knew that the dam could break.
Why did they not evacuate before the storm?

Just going to throw this out there— did they know the dam might fail? I'm not being contrarian or arguing for the sake thereof, just wondering if they actually knew. 'They' can be both the "authorities" and the people they're supposed to notify.

Where are the school busses to evacuate these people?

Jindal's sending them from LA because MS didn't have them ready. Go figure.

[Uncle Slayton]

Everyone should know that a levee or dam can break during a hurricane.

Those people should have known.