We never see flashbacks of when they were small. One gets the impression a degree of their behavior may have been due to some flaw in parental influence.
Suppression of the bow and arrow was due to influence of the patent office in Valthor’s lost city. The spear industry made it a practice to buy up the licenses every time some yokel invented the bow, and deep sixed the technology. This was felt a financial necessity due to loss of revenue by the thriving spear industry.
It comes on in about nine hours.