Compulsory Organ Donation

Should organ donation be made compulsory?
This issue is at the heart of the medical system, with the growing number of patients on waiting lists for transplants should those persons who die and are capable of providing usable organs be made to do so? (well their families anyway). Already doctors are able to ask the dead person's relatives whether they can use the organs, but should the law go as far as requiring the donation? One argument is that all usable organs should be made available, however the opposing argument notes the patient's right to autonomy and highlights that the choice is with them. We ask therefore whether a patient's autonomy extends past their death and should their body continue to be respected? Or should we go for the greater good and help all those waiting for help, which they are able to provide? Especially if the person involved later is cremated.
You may say that some of those people on the waiting list don't deserve the help because they require a transplant after self-indulgence, but for many people their need is through illness or defect.
If it should not be made compulsory, should more people be aware of the option?