I doubt that the vacksinated were really the only ones to die. Why would a vackseen be developed if nobody was dying in the first place? I do believe that after the protection wore off, the vacksinated ended up being more vulnerable and that is becoming apparent with COVID.
The problem is some vaccines introduce something to your body (antibodies, for example) so if you then catch the disease/the vaccine doesn’t prevent infection, your system could be overloaded.
In any case, what they are injecting today fits no definition of “vaccine” as I’ve understood it (and they changed the official definition because a blind man could see that).