I wouldn't make such a broad prediction, but it is easy to see schooling decreases personal authority, without which the individual cannot act altruistically or selfishly (I argue both are the same, but depend on what one considers self - John Livingston's 'Rogue Primate' expounds on this concept). I would suggest looking at the Amish culture as a case study. Historically, you can contrast early America (that of Franklin, Jefferson, Edison and the other American pioneers) and Hitler's Germany ( the Nazi system was adopted from the new American schools and called the Indiana system by Germans so I have read). I would, based on these and other examples predict that the students raised outside the school system would have greater potential for many qualities including altruism, but that manifestation of these qualities will vary by environment and individual.