Cause there are no seat belts on the submarines or battle ship destroyers today either are there?? And when you think about it, these vessels are pretty futuristic as compared to those of the mid to late 1960's during Star Trek's hay day. Of course the Apollo Rockets and even the Shuttle has seatbelts, but as we all know, they.....well.... it takes a lot more than just seat belts to save lives when dealing with the extremes of space travel.
Now For a little Jeopardy
Famous Ships for $500 please Alex
" A Daily Double"
Which of the following ships had seatbelts
The Millenium Falcon
The Jupiter 2?
The SS Minnow?
PT147(McHale's Navy)?
African Queen?(Bogart/Hepburn)
Titanic
QE1 , or 2