I've read the comments and I have some theories of my own. I believe that vaccines were originally discovered and proved invaluable. I believe that big pharma has since corrupted and co-opted the efficacy of vaccines for its own profit and no longer choose to make "perfect" vaccines. History tells us how devastating the polio, scarlet fever, measles, mumps etc were. The death rate prior to vaccines took an enormous toll on children and adults of all ages. The original pioneers of vaccines were true scientists and doctors that were trying to find cures. They succeeded. As with any tool, the greater the potential for good, when misused, it has the equal potential for bad. I believe that benign viruses do strengthen our immune systems and may also educate our immune systems to fight the more malevolent viruses. The issue is pharma has co-opted vaccines and has taken the route of creating profit generating vaccines. Now, globalists are leveraging Pharma to regulate population. Just my opinion. I don't believe the various blood types are linked to any plan of any kind by humans. O is the oldest and original blood type, then came A, then B and within the last 400 years AB. The original 3 blood types have been traced back for thousands, if not tens of thousands of years. It simply is what it is. We can speculate why the blood types came about, but it isn't a part of any conspiracy of humanities making. Some diseases and illnesses affect some blood types more than others. I think the blood types thing is biodiversity at work. This aids in preventing any one pandemic from killing off an entire species.