Even with the help of a systematic vaccine you can not protect yourself from all diseases, because every day new viruses can appear.
Right. And how much less protection you have when you get vaccinated, because the vaccines wreck your immune system... at least somewhat.
Vaccines are destroying the immune system of a person. On the contrary, they stimulate it. It's like exercise. If you regularly perform exercises that your muscles are toned and you to easily overcome the load. If you spend your days lying on the bed then in time, you will be hard just to take one step.
It's more accurate to think of our immune systems. Plural. Our bodies have multiple protective systems. Vaccines only work on one aspect of immunity. It's like adding a turbo to an engine but not upgrading the cooling system. The engine will fail because of the 'upgrade', and I think that it is this principle which is causing a lot of auto-immune problems and others. Of course these are not as much of a 'problem' for those who own shares in pharmaceutical companies.
I'm enough of a believer in the principle of excising one's whole immune system that I am relieved to get a touch of whatever seasonal bug is going around if I've not been sick for a while. Most of the time I either don't catch the bug, or feel a little funny in the throat one morning then it passes. Very rarely do I get sick enough to stop doing whatever project I'm doing. Only once in the past 4 years did I lay around in bed and sleep a lot one day.
Immunity aside, there is a significant difference between eating something and having something injected directly into one's bloodstream. Basically, everything one consumes is broken down in the gut into more basic components and only then passes through the intestinal walls. The good stuff (lipids, proteins, sugars, etc) are selected and the bad stuff dumped. Aluminum, for instance, is very common in the environment and our digestive systems have had millions of years to figure out how to deal with it. Injecting it bypasses all of that and can be quite dangerous. It's why ticks and mosquitoes and so forth are potentially quite problematic (and, parenthetically, why these creatures have long been of interest to bio-warfare developers.)