I think it depends on what kind of "extreme" video is involved.
If "extreme close up video" means an endless parade of photogenic tornadoes that are seen only touching down in open fields, with no one getting hurt even when buildings are seen to be destroyed, and chasers whooping it up to their heart's content, perhaps that may "desensitize" people to a certain extent, to where they think ONLY of the exciting part of storm chasing to the exclusion of all else. Isn't that why some call it "torn porn"?
But if the "extreme video" in question shows what happens AFTER the tornado -- the flattened homes, crushed cars, stunned and weeping residents trying to find their way through a neighborhood they no longer recognize, etc. -- I would think it would have the opposite effect.
I would really like to see some talented screenwriter or producer tackle a movie or TV series (fictional or reality/documentary) that would deal with the aftermath of disaster and follow a community through the stages of recovery... I think there would be lots of potential there. Something that
starts at the point where most disaster flicks end. (I know TWC just launched something like this). Done properly it could provide a needed balance or counterpart to the types of shows referenced earlier.