Although I can see the validity of your first statement if we are talking about extremely hot weather and no air conditioning, friend, do you really believe that wearing a suit and tie while sitting at a desk all day is always "just plain stupid," or do you think that there are perhaps exceptions? And as far as somebody forcing another person to wear a suit and tie, I tend to think that there are other social/fashion conventions that people voluntarily adhere to, the sanity of which is more questionable...
It just serves no purpose, I hate wearing ties also (something that really serves no purpose). I work in NYC, the summers are too hot and humid and in the winters you just can't dress warmly enough if you have to wear a suit jacket. When it rains, the rain comes down sideways so your pants below the knees get ruined (umbrellas are useless). I sit in front of seven computer monitors for ten hours or more a day so I'd rather be comfortable than fashionable. When I have to see a customer they all dress casual and you always dress to the level of the customer. So there really is no point anymore. Business casual is the best thing thats ever happened !!! If I ever retire the remaining suits are going into a bonfire along with my alarm clock !!!