To be fair, it's not a law but a social agreement based on humans own perception of importance. That perception might have some basis in Biology as animals also give the priority to their offspring in survival situations. The idea behind this is that the most important thing for life is the continuation of life itself. For humans, is the survival of the species. Women can have children and that makes them more important. Not saying that men are useless but in order for life to continue you might have to sacrifice the weakest link. Testosterone itself could be seen as a suicidal hormone as it makes men more aggressive and careless for their survival. In a way, it's just how men were designed.
Equality is all fine and dandy, but it can only go so far before nature itself steps in. (This train of thought won me a bit of opposition back in college. The memories.)
“Simple minds have always confused great honesty with great rudeness.” - Sherlock Holmes, Elementary (2013).
"Did you guys expected some actual rational fact-based reasoning? ...you should already know I'm all about BS and fraudulence." - FunFan, VGchartz (2016)
