This is full of strawmans and it doesn't even address the specific concerns of the current vax, which arguably is different than before.

First off, biology is the most uncertain of all sciences, perhaps second to psychology/psychiatry (which could be considered part of biology in a way). Only a few decades ago, in the 1970's the government endorsed studies that said eating fatty foods is bad for people. They released a pyramid with carbs at the bottom, and fats at the top, meaning you should eat more carbs than anything else. This created an obesity epidemic that we're seeing right now, because people over-eat carbs and thought that eating fat would mean getting fat. New studies on nutrition say something completely different, and recommend a different diet. How could they have been so wrong and created such a huge obesity problem? Because biology is very complicated and one of the younger sciences out there. (also money)

Unlike physics or maths, biology is constantly changing. There are many missing parts to the big picture, it's usually approach via trial and error, as oppose to a working theory. So in medicine when something works, often times it's because they tried it many times over and over, and they can see it "works", but they don't know how.

We might know the basics of immunology, and "vaccines", but the human body might be doing something more complex that we don't yet know of. Again, all of this is at best 100 years old, AT BEST. Physics, math, for example, has been going on for THOUSANDS of years. 200 years ago people didn't even know about the basic structure of a cell, and 70 years ago we just discovered the structure of DNA. We only have a very basic idea of what DNA is doing if you put it into perspective.

Obviously this video has an agenda. OBVIOUSLY. A scientific minded person is ALWAYS skeptical, instead of trusting something blindly, specially a young science, with special interests in making money.