> Vaccines do have published risk of complications Yes, so the selfish will avoid the risk and free-ride on the herd immunity. In a society that is irrational

> Vaccines do have published risk of complications Yes, so the selfish will avoid the risk and free-ride on the herd immunity. In a society that is irrationally selfish, the government may reasonably choose to give incentives to vaccinate. For example, the vaccinations might be required for admission into government-paid health care, or the government could compensate victims of the side-effects with care, cash, etc.