Evidently you're not familiar with moral philosophy, but there is a difference between taking an action that you know will kill random people vs. not taking the

Evidently you're not familiar with moral philosophy, but there is a difference between taking an action that you know will kill random people vs. not taking the action and leaving things to accident. Also, there is a problem with the hypothetical, since there are other means of reducing disease than vaccination, e.g. aggressive quarantine and disinfection, trending toward telecommuting or smaller school classroom size, etc.