It can not be overstated that the best approach to medicine is prevention. A majority of the patients in need of organ transplants could have prevented their condition through proper life-style choices. As far as transplants themselves, it is clearly obvious that there is no shortage of human organs. Unfortunately, most of these organs go unused, as organ donors are all too uncommon. The most sensible policy to address the shortage of human organs which are available for transplantation would be to increase human donation.
Xenotransplantation is an example of totally unjustifiable exploitation of animals.
Proper lifestyle choices would eliminate much of the need for organs immediately. In cases where transplantation is warranted, human organs are undeniably the best, but a lack of human donors makes these organs scarce. The simplest solution to this problem would be to increase the availability of human organs. Public promotion and an improvement of the system which is in place to gather human organs would quickly and easily solve this problem, if they were given any support whatsoever. Instead, researchers are spending millions of dollars and countless animal lives trying to overcome enormous scientific problems.