In addition to your other responses, I'll add this. There's not really a plausible mechanism that could cause problems to happen long after the fact. Although it sounds exotic, the mRNA vaccine is just using the same process every cold or flu you've ever had used, but in a more limited way since the proteins created by the vaccine cannot reproduce.

By 2 months all traces of vaccine are long gone and you're just left with an immune system trained to fight COVID (just like millions of people have already had happen naturally). So, while everybody has their eyes open, nobody can really explain the mechanism where something might happen.