I have been in a couple of major outbreaks- beginning with Good Friday in '65 (which I hardly remember) and in western Ohio in '74 (#38 removed part of our barn roof). I have thought about this and studied extensively - sociology, psychology, building methods, etc.
I have a list, it may not be perfect- but by golly it is a list
1.
Not building houses with basements anymore- or what we called cellars. Every house had one at one time- because that is where you stored the coal you burned. When I was 13 in Ohio in '74 I had not lived in a house that did not have cellar, mud room or basement. In the midwest to plains everyone had one- whether it was under the house or separate- and everyone knew to hop to when the weather looked iffy. The Xenia death toll would not have been as bad if more people had been home.
2.
Newer building methods. They are cheapening building methods even while driving prices up. A big excuse for 'no cellar' by the building industry is that the new houses are 'tied in' to the slab foundation. Well I have seen more clean scrubbed (newer) slab foundations in the past 2 days than I would ever want to see again in my lifetime. 'Ties' don't stand up to an EF4-5.
3.
Noise pollution. People are constantly surrounded by blaring noise these days. A lot of people intentionally tune out most of what is assaulting their ears, especially mechanical to electronic sounds. The Japanese have it right by using Voice Recorded warnings over loudspeaker systems for disaster EBS. This is why the FAA and Airforce insists on Voice recordings in cockpits to warn pilots. We need to use a combination of Siren and Voice everywhere- like what they do in Arab, Alabama. "TORNADO APPROACHING YOUR AREA- TAKE COVER!!" repeated in between sirens would leave no one confused about what is going on.
4.
Presentation is everything. If your station meteorologist is interrupted every 15 minutes for a Taco Bell commercial in the middle of an outbreak- fewer people are going to take it seriously. Again, I watched James Spann yesterday on ABC33 and he stayed on target with every sig - and it was rough. When it was time for the nightly news to come on Spann said "And it's time for the News and tonight the News is the Weather." Period. No ifs ands or buts about it.
5. Unfamiliarity with death and destruction. I think a lot of people live in 'TV Land' in their minds. The only death or injury they generally see throughout their lifetimes is fake, and they know it is fake. In the old days if someone died he/she was usually laid out at home. Most recuperation from accidents (and there were more of them because equipment used to be more dangerous and people more often did hands on work) happened at home. So I believe there is more of a 'can't happen to me' mental block in society at large.