Er, no. The mother and father have exactly the same genetic stake in a child; that is to say, (on average) 1/2 of the genome. However, the mother has a higher material stake; she spends 9 months gestating the child, and roughly 2 years suckling it, while in the meantime unable to support another child, whereas the father need only contribute sperm. A father can therefore go on to sire numerous children simultaneously, thereby increasing his chances of having his genetic heritage passed on, while a mother is biologically required to care for and nurture a child in order to protect her genetic heritage. Compounding this is the fact that a father may never be certain that a child is actually his progeny; it is, in fact, to the mother’s advantage to sleep with the strongest/smartest/most handsome man she can find (and as many of them as possible), but form a permanent alliance with a male most likely to provide resources for her children exclusively.
One can see this kind of evolutionary calculation with bees; by giving workers a heavy genetic investment in the queen’s offspring (even though they can have no offspring of their own) it is to their advantage to sacrifice themselves in order to continue the line. They don’t actually think about this, of course; it’s simply a result of the genetic “strategy” of gene propagation.
However, humans do think, and this kind of hypothesizing assumes that human sexuality and reproduction are merely behaviorist responses that are genetically hardwired into the brain which fails to take into account social and environmental influences. Human beings are not bees; our relational programming is not so simple as to conform to a small set of easily measurable parameters. Fathers in tightly knit societies where abandonment is looked down up will tend to remain with their children out of a sense of duty and to conform to expectations, whereas dads in highly transient societies (where fathers may not be needed or even wanted) will roll on because there is no advantage to hanging around, and most likely the example of fatherhood was not presented to them. Genetic programming or not, most of our social behavior–how we interact with others–is learned in childhood via emulation of primary adult figures. This isn’t to diminish the influence of genetics on emotional impulses or neurological problems, but our actions are based on the examples that have influenced us.
As for the debate on whether fathers are better/worse now than in the past, so far I’ve seen a lot of anecdotal claims (based upon the personal experience of the claimant) but not a single cite which establishes either position. Certainly, childhood abandonment by one or both parents is far from unusual–one need only look at the pantheon of jazz greats to see that the vast majority of them were abandoned or abused by one or both parents–and the “Father Knows Best” nostalgia of the past is mostly crap; plenty of people who grew up in white-bread '50s suburbia have the same complaints about uninvolved (if not physically absent) parents as everyone else.
We’ve heard much in recent years about (dare I repeat it?) “young black fathers abandoning pregnant mothers and children” but in fact the fathers aren’t needed to provide in a material sense, and the cultural example most commonly seen there is children raised exclusively by mothers and grandmothers. I suppose we could make some kind of sociobiological attempt to tie such a behavior to “black genes”, but not only would such an argument come under fire from critics of bigotry, but it would also be highly suspect in any scientific sense. We might just as well argue that “white, single mothers” are the result of some kind of genetic virus working its mechanism on middle class Caucasians, instead of acknowledging that a relaxation of societal prohibitions against unwed motherhood, combined with the greater mobility and reluctance toward lifelong romantic commitments, and supported by a vast increase in possibilities for women to be economically self-reliant plays a much larger role than any kind of genetic influence, especially one that defines itself in the purely intellectual construct of “race”.
So, why are there so many crappy fathers (in your provincial view of the world)? Most likely 'cause they had crappy fathers who didn’t provide a good example of being a good father; or because they have other emotional or mental problems (alcoholism, depression, neurological disorder, et cetera) which prevent them from enacting the role of a responible parent.
Stranger