I am not in medical field, but I have great powers of observation and common sense. I see 150,000,000 Americans already have at least 1 shot of covid vaccine, and I have not seen reports of mass problems, much less mass deaths.
I have talked to dozens of seniors in my Florida condo community, almost all are vaxxed, and have not heard of a single serious problem other than mild flu like symptoms for a couple of days following the 2nd shot.