I agree with you, except the part where you asked if you have gone house house to house in a snowstorm, mail men and women aren't the only ones that work in snowstorms. And just because there is a shitty aspect to a job (delivering in snowstorms) it doesn't mean it's cool to strike.
It's like someone getting mad at say, a power company, for striking. If someone speaks on that in a negative way I wouldn't say STFU YOU'VE NEVER FIXED POWER LINES IN A WINDSTORM!!!!!!!!!111!!!1!!! When in reality that hardly ever happens.