Do you trust your wine store?

Wine professionals will always tell you to store wine at a constant temperature and never keep it in a place that is too hot or too cold.  Well this is fine with the wine you have at home, but how do you know the wine made its way from the winery to your cellar without hitting an extreme temperature?  How do we know it wasn’t cooked or frozen?  It could have been left on some truck in the middle of the Canadian Prairies when the temperature hit -30C.  Do we really trust the AGLC, they are part of the government.  How do we know the wine store properly stores the wine?  Maybe they had no room in the front so they stored a bunch of wine in the back room by the furnace?  I think it would be interesting to have temperature gage on a bottle of wine to find out if the bottle has been in an extreme temperature.  I am picturing a small little strip on the side of the bottle that would turn a bright red when the bottle has been exposed to high temperatures for too long or turn blue when the bottle has been in a cold environment for too long.  Not all of the bad wines are due to the cork?