The majority define it from the perspective of agreeing that this is how a decent person behaves, that does not mean that that that is how the majority behave at all. A lot of people are all talk when it comes to upholding morals.
Even many of the cheaters and the abusers etc will hold the same view of what constitutes a good man, but for whatever reasons they excuse themselves or paint themselves as a victim of circumstance etc, in their minds they're not a bad guy, or a 'real' abuser, they're just controlling because they love their partner so much, and that's completely fine and different.
The shit dads who think that a decent man does the very best that he can tells himself that it's not his fault, if it was up to him he'd have the kids 24/7 and then proceeds to make no effort whatsoever and blame it on the ex, and still tells himself the kids are his 'world' and probably even gets the tattoo to prove it!!
So the majority can agree on what constitutes good morals but that does not mean that the majority actually behave that way.
As for looking at it from the objective stance,
Well yes the countries with less murder/rape etc are going to function better than those with more, but that doesn't necessarily mean that society is functioning well here.
Just because men might behave worse in other countries doesn't mean that we should be grateful that they're not murdering or raping at the same rate as they would in other countries. This is like what I said men say to women when they try to break up with him, they pick the worst man they know and say at least I'm not like him, as if you should then be grateful that he isn't the worst man you know and should then tolerate whatever crap he wants to throw at you.
In countries rife with violence, men may have grown up to be desensitised or traumatised which makes it more likely that they will perpetuate harm, so it shouldn't be surprising that men in less violent countries behave better, the baseline expectation is higher, if they acted the same as men from more violent countries then they'd actually be worse than them, because there's less of a reason for it. As the standards increase in civilisations, we are allowed to expect more from men and not be treated like shit and to expect them to try their best to be at least decent fathers, the fact that society still functions does not prove that the majority of men are able to do that.
There's a growing trend of women deciding to be single for life rather than ever having to deal with a man again, and then on the other side we have men who are equally critical about women but yet are still obsessed with wanting them, if the trend continues, which I believe it will, especially because we also have a growing trend of women wanting to remain childfree, then we're going to end up with a lot more bitter, angry men and that never bodes well for women or for society.