Delta variant was pretty lethal. One million Americans dead. But not really a big deal because it didn't kill the young and the healthy unlike the Spanish flu. We saved some money by not paying Social Security.
The excess mortality rates are showing up in the 16–49-year-old age groups. Mortality rates for the 65+ age groups have barely changed and are within expected statistical variance.
Whatever the effects of COVID or the mRNA treatments may be, they are affecting people who should be in their prime working years.
It is going to leave a mark.