wot a load of tosh. what about "mass". it's well known that mass can cause more damage. like for instance, if you get hit by a spark off a sparkler which burns at a very high temperature, about 500 degrees, you don't even notice it, because not much mass, but if you pour water on you that's only 100 degrees it causes a lot of damage because of the mass.
same with an iceberg init? It's got a lot of mass, i mean this things are like underwater mountains, and therefore is very dense. pretty obvious to me it's gonna cause a lot more damage, just down to it's sheer size and density, than a measly icecube.