whatme, I don't think it's 'truth' - you can research something, and even demonstrate it, but this only means it's been demonstrated by you, in those specific conditions.
I do not honestly see how you could research this without the stated interests becoming tangled up with all sorts of social conditioning. That's not a criticism of the authors - I imagine they are aware - but I think it's a bit of a misunderstanding of how science works to generalize from these studies and make universal claims like 'men find this' or 'in times of stress, men do this'.
We don't - and cannot - know that.
We can only work out that men from these samples do this, or that.
Because you can't take a human being out of its social environment and use it as a control, there's a limit to how much you can ever exclude that social environment, so you also have to factor it into your conclusion, and add the caveat that your research only applies to the social environments you've studied.
To then take these limited conclusions out of context and see them as making external commentary on 'today's world' isn't tenable.