I think this is a difficult question. While vaccination should be a personal choice in some instances, the fact is that parents who choose not to immunise their children are relying on 'herd immunity'. That is, the fact that all th ekids around them are immunised. There are studies that show diseases like whooping cough are returning in areas such as Byron Bay where kids immunisation uptake is low.
Having said that, I don't think it's necessary that babies are innundated with vaccines, sometimes up to seven in one injection. I think that causes stress, not immunity.