Naturally, to attempt as much, let's tap the GSS. The survey doesn't deal with psychopathy and sociopathy explicitly, but a few variables feel like plausible proxies. First, a fertility comparison among men who both say there is nothing "seriously wrong" with cheating on taxes and who have also cheated on their spouses (psychos) and among men who find cheating on taxes to be morally objectionable and have not cheated on their spouses (suckers) (n = 223):
And, more explicitly, among men who say "a selfish person" is at least a "fair description" of themselves (psychos) compared to those who say it is an inaccurate self-description (martyrs) (n = 1085):
There is more fecundity in the first table because it only considers men who have been married at some point, while the latter catches all men (and also a wider range of years).
Hardly definitive, but at any rate the data doesn't provide any reason to think that psychopathic traits are evolutionarily advantageous any longer, if they ever were. That, of course, doesn't imply that they aren't sexually advantageous, especially among men sly enough to break the rules and avoid detection in so doing (purely speculative, but I'd guess high IQ psychopaths fair better relative to high IQ non-psychopaths than low IQ psychopaths fair relative to low IQ non-psychopaths).
For brevity, I'll subsequently refer to archetypal psychopaths and suckers. Clearly most men fall somewhere in between, some closer to one end, some closer to the other.
It's not difficult to conceive that, at some point in the fairly recent past, psychopaths may have successfully spread their seed more effectively than suckers did, perhaps after large scale movement into cities and out of the countryside but before the ubiquity of easily accessible birth control severely separated procreation from sexuality (so long as there is some amount of the latter existing, obviously--it may be the beta's time to be fruitful and multiply, but the omega never has and never will).
Similarly, it's not difficult to see why psychopaths would be 'hurt' (in terms of reproductive fitness) more from the widespread availability of contraception than suckers would be. Psychopaths are all about getting what they want. What they want is evaluated narrowly--as Heartiste puts it, the psychopath "is missing, or seductively convinces himself that he’s missing, a moral sense, save for that morality which accrues to the self". Suckers, stoics that they are, for various reasons (religious and otherwise) assign a lot of other duties to themselves, one of which is often raising a family. Psychopaths want sex but have no use for the attendant cramps that kids bring, especially the nearly unavoidable and legally sanctioned drain on their financial resources that come with. Suckers want sex, too, but they also want--or are at least willing to shoulder the responsibilities that come with--children.
Pat Buchanan famously called the pill the suicide tablet of the West, but it might be making us, ceteris paribus, more family-oriented people. When psychopaths see the following, it fills them with dread. When suckers see as much, they get an incomparably deep feeling of joy in the very marrow of their bones (yeah, I'm revealing myself to firmly be in the sucker camp, but go ahead and eat your hearts out):
Hopelessly smitten orbiter at your service!
The big question is whether genetic selection for men with a nurturing instinct can outrun cultural solipsism and broader societal dissolution. Women who have children are, according to the GSS, modestly less likely to cheat than women who don't have any offspring are, so to the extent that women are hereditarily steering the ship one way or the other, it's gently in the direction of overriding the tingle/settling and away from harlots surrendering to their passions.
As Heartiste also points out, that female contribution is a feature rather than a bug. As an aside, the average number of children among SWPL women living in big cities is 1.40. Among conservative white women in small towns and out in the countryside, it's 2.05.
GSS variables used: EVSTRAY(1)(2), SEX, AGAPE(1)(2-5), SELFISH(1-3)(4-5), CHILDS