"The sad fact you stated here doesn't have anything to do with the fact that vaccines are most often able to protect us from various diseases."
Good hygiene and nutrition are the primary bulwark against any disease. The sad truth is that Africa has large populations in abject poverty, and that have access to neither.
I would far prefer to be availed of proper hygiene and good food and unvaccinated than the reverse, and not only because I'd be more comfortable, but for the vastly improved ability to respond to disease and heal.
Good hygenie and nutrition are of course important and I would prefer them over just having vaccines as well.
However it is not just hygenie which is accountable for the drop in case reports for many disease. Look up my latest post for more detail here.