Blowing Levees

Damn.  They're talking about blowing the levees above Cairo. This will murder the farmers' ability to make a living this year.  Apparently it didn't help in the "Great Flood of 1937" the last time they did it.  What on earth is different today to make them, the US Army Corp of Engineers, think it will work today??? It's not like the USACE has a great rep. Um, Katrina and levees anyone?