I have bad news for you (unless it was irony, which I can't rule out): the SARS-CoV2 virus contains its genome as RNA that is used directly (IIRC) as mRNA. Because it's needed for the protein synthesis to build new virus particles. This is true for every virus, BTW: they either contain RNA that can be used by the cell for protein synthesis (i.e. mRNA) or they do synthesize (or make the cell synthesize) the mRNA based on their genome, one way or another.

So no matter what, you'll get the viral mRNA in your body. Either through infection or through the vaccine. The vaccine just contains a small fragment and it does not proliferate. Unlike the virus.

mRNA has potential to be dangerous. There is nothing inherently dangerous in what our bodies already use as building instructions, nor is there evidence to suggest current mRNA vaccines cause any of these theoretical issues.

Yeah, plus on top of that, anything has the potential to be dangerous. Take, for example, water. Everybody knows about its positive sides, and about most of the negative ones.

But 99% of people don't know that water can kill you. I'm not talking about drowning.

https://en.wikipedia.org/wiki/Water_intoxication

If the most benign substance on the surface on the planet can kill you, anything can.