See Chock Pullers link above - tornadoes clearly are a bigger issue than many realise.
How so? Ask anybody who lives in a tornado or hurricane prone region and they fully know the risks and protentional results with some having a more intimate knowledge than others. I think the question is, given ICF construction methods have been around for 60+ years, and since you imply it is the panacea for this type of damage and cost, why do you suppose ICF methods are not mandated in these areas by public building codes, but more importantly, by insurance underwriters?