tornado warning and svr warnings

ok another topic of interest to me .i'm not blasting anyone but why is it when the nws issues the warning people won't leave there moble homes ,it just don't make any sence why people won't there moble home a small ef-0 can tip of a piece of junk like that.i understand people leave in whatbthey can efford ok no problem with that my problem is when i read spc storm reports i see moble home destroyed deaths because people won't leave them it tears my guts out .again i live in cali now and again we get a cold front that come thru here with hi winds 45-60 mph there is a moble home park i see them shake but no destroyed i can only imagine the fear people have when a tornado is beaning down on them so why people don't u leave ur " death traps" to find suitable shelters i know sometimes theres just not enough time to leave and find shelter but just leaving then improves ur changes of living thru one.