A good leader for who? What does having a mistress have to do with being a good leader? A wife is there to get sex from and for business dealings/image. Any resistance to the sex and you got an issue.I agree with your recommendation that men should not get married. I don't endorse the cheating, however.
If men are supposed to be leaders, then they should be good leaders.
Do what well? Doing marriage well? Come on bro, you think people wouldn't buy cars and fly airplanes because the inventor had mistresses/cheated on his wife?They shouldn't half @ss it. Anything worth doing is worth doing well. So if you are going to lead, you should lead well. Part of this is leading by example, and role modeling appropriate behavior. Unless you have an open marriage, and expect your wife to screw around also. I know PUAs say "But men are different, we're built to spread our seed", but I call bullsh!t on that. Not that we aren't built to spread our seed. But for every man that cheats for sex, there is a woman who cheats for the attention. Whatever the rationale, the result is the same.
Marriage isn't about love and emotion and feelings and being a 'role model'. It's about image and money and doing what is best for you. You get married if it's best for you and you have mistress in case the wife denies sex.
Who are we trying to lead? The women of the world? We are living in a feminist dominated world because too many men and politicians are afraid of women. They wont stand up to them because they think they won't get sex anywhere else.Men often look to the 1950s as an idyllic time, when women were subservient and men ruled the world. But this is one of the reasons women rebelled against that. Too many men abused their leadership position by having affairs, becoming addicted to alcohol, and battering their wives. Had the men led responsibly, perhaps we wouldn't be living in this feminist dominated world right now.
I don't think anyone is advocating cheating. If the wife always remains young and good looking and always gives you sex and doesn't cause you any emotional issues while expecting more and giving less, who needs a mistress? But alas, nature is not built that way.