Because these are traits that, in the right amounts and with the right intent, make a good man, a strong man. Other men should strive for them because, as men, we are responsible for the safety and freedom of society.
But cheesesman, why is it men that are repsonsible?
It is because men are, for the most part, much more physically powerful than women. I believe that humans have a moral obligation to protect the rights and well-being of those weaker than us. So, as a man, it is your duty to protect people who are not as strong as you; be them other men or women. In the United States, only men are eligible for mandatory military service (the draft). Women, under Federal law, are exempt from being drafted. Now, a woman can still volunteer to serve in the US armed forces, she can still fight on the frontlines and give her life, but she cannot be forced by the government to do so. Men can, have, and will be required to join the military, to fight, to kill, and to die. The reason mandatory service exists is because for centuries, for millennia, men have been expected to fight in wars. We have held the responsibility to fight for our nations for as long as nations have existed.
Wars are horrific. A British officer on the frontlines of WWI said, "Anyone who says he enjoys this sort of thing is either a liar or a madman." A sane human being does not want to be shot at, see mutilated corpses, or kill another human. But it happens anyway. In the Second World War, five-hundred thousand American servicemen were killed in action. For the Russians, the number was more than triple that. They knew there was a chance they were going to die, that they would never again see their homes, their friends, or their families.
But they went anyway.
They went, fought, and died not because they wanted to, not because of the little sums of soldiers' pay, not because they wanted to see the world. They went because it was necessary. Because it was their duty, their responsibility. If something must be done, you do it because it must. And those men did.
Why? Simply put, they were men. They recognized the moral obligation put on them by being stronger than others; an obligation, as I said earlier, to protect the rights and well-being of those weaker than you.
A weak man who is also an evil man is far, far more dangerous than a strong man who is also a good man.
I don't quite grasp what you're trying to say here, but I'll answer as best I can.
I believe that there should be standards for everyone. Since we're in a Sanderson forum, Ideals, if you will. Those things that I listed are ideals that I strive for. I workout and do combat sports so that I can be physically capable, I do competitive debate so I can have mental strength and fortitude, I am very reserved and calm in my demeanor so that I will be calm in the face of adversity, and I hone my professional skill so that I can have self-reliance and be financially secure.
Again, I'm not quite sure what you're asking with that second question, but that's the best answer I'm able to give.
Did you mean necessarily or is what you wrote what you meant? If it's the latter, I would direct you to my first answer.
But here I'll answer if it's the former.
The reason these are masculine attributes is because they are the attributes that you see traditional men have. My grandfather is the best embodiment of all them. He was a Marine, so he was (he's 71 now, but still awesome) physically capable; he does not let his emotions control him, even though they run deep and strong in him; he is a very quietly intelligent man, and well able to hold a philosophical conversation or defend his beliefs and his faith; and he grows and hunts his own food on his own land.
I am not saying every man should be like my grandfather, but I am saying that what I listed are the foundations of a good, strong man. You can embody those ideals and be extremely different from the men I know. You can be any political party, any race, any sexual orientation, any religion, and still strive to be a good, strong man.
Those attributes are also the sum of great men from history; men like Caesar, Alexander the Great, Richard the Lionheart, William Wallace, Leif Erikson, George Washington, Horatio Nelson, Napoleon Bonaparte, Abraham Lincoln, Theodore Roosevelt, Desmond Doss, Martin Luther King, Jr., and scores more.
I believe we should strive to be like great men from history. And those attributes are what will start you on that path.