I suspect that it is because, in the minds of many, it is seen as a result of weakness, and confronting that myth as well as dealing with the problems stemming from male identity issues / lack of emotional awareness & maturity in men, is just too difficult or challenging to many.
I consider myself to be fairly aware of feelings and my own sensitivities, as well as my insecurities, and yet I still struggle at times. So goodness knows what more 'old school' men go through.