That is not an ethical problem as there are already plenty of completely unvaccinated children and even some adults who would volunteer to be a part of the study. My 3 children could join and I know many others who would too. The unvaccinated population and vaccine-damaged families really, really want to put this to rest and show our kids are healthier. Lots of families have the oldest child(ren) vaccine damaged but have younger healthy unvaccinated siblings. That is a very poor excuse to not do the study.