The technology for this vaccine is over 20 years old. Just because it's the first authorized one of its kind doesn't make it "experimental"
> with no long term studies
There are also no long term studies on the effects of COVID. There are no modern vaccines that have ever had and significant long term effects that didn't manifest within the first month or so after vaccination. (Dr. Offit goes over this in an episode of Oh No! With Ross and Carrie: https://maximumfun.org/episodes/oh-no-ross-and-carrie/ross-a...).
> questionable efficacy
In fact, we know the efficacy to be quite high. Just because something isn't perfect doesn't make it worthless. It's still the best way to prevent infection.
> A lower mortality than the flu
We're talking about a difference in mortality for children of around .01%. Even if true, it's an irrelevant fact. The main personal argument is to protect others in the family, including possible immunocompromised individuals. I've personally lost a mother and two grandparents during this pandemic. You really think, if given the choice between killing their grandparents (with a high likelihood) and a 1/80,000 chance of serious side effects (and no reported deaths) from a vaccine, that most people should opt not to get the vaccine? You fucking psychopath.