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Normally you would need to take a vaccine one or two times, in a span of several years or even just one time in your life, and then you trained your imune system against the pathogen.That's an incomplete understanding.
If you really want to understand vaccines, you need to start by understanding our immune system, because every vaccine platform interacts with it.
Basic primer links, in order of increasing verbosity. Note that all of these are first-semester, undergraduate-level understandings of the topic for people who actually develop drugs. The details get much more complex.
[0] https://www.cedars-sinai.org/blog/why-vaccine-boosters.html
[1] https://www.ncbi.nlm.nih.gov/books/NBK279364/#_i2225_whichpa...
[2] https://pmc.ncbi.nlm.nih.gov/articles/PMC4590614/
> With mRNA vaccines, you are not really protected against the pathogen, you are still vulnerable, although supposedly less.
You are protected against the pathogen, because you're generating the same targeted antibodies as other vaccine platforms stimulate.
Also, that mRNA injections are inherently consumed by the immune system as part of their function is specifically what increases mRNA vaccines' safety profile, as opposed to other vectors (e.g. carrier viral). [0]
The fact that boosters are needed has nothing to do with mRNA being used as a vaccine platform, but is instead a characteristic of the virus being targeted -- if you made a measels vaccine using an mRNA platform, it would also be a once-lifetime vaccine. (Because measels isn't as liable to mutate as flu-type viruses)
Why isn't that done? Because mRNA platforms are newer, and we've already figured out effective vaccines for the more "easy", less mutating viruses of consequence.
[0] https://www.mayoclinic.org/diseases-conditions/coronavirus/i...
> I find it suspicious that there is so much opposition to people that are sceptical about it.
Because (a) COVID was a worldwide pandemic, (b) during that pandemic certain people used vaccine skepticism for political gain (whether or not it had any factual basis), and (c) there are people (RFK Jr) who make a substantial amount of money by talking/writing about vaccine skepticism.
The annoyance and hostility towards those making bad faith arguments for personal gain are less to do with closing down discussion and more to do with judging people who actively harm public health.
Or to put it another way, if RFK Jr knew that measels vaccinations would stop the outbreak in Texas, do you think he would say so?