Vaccinating a full 5% of your entire population within one week may be a good idea if you have a safe vaccine. Vaccinating 10% of your entire population within one week may be good also — as long as you have a safe vaccine.
But if the vaccine that you inject into people isn’t a very safe one, then it is expected for excess deaths to rise during and shortly after you administer so many vaccine doses out to so many people.
Check out the time series of changes in the rate of vaccination in Israel, along with changes in the weekly excess death per million (WEDpM):
The disturbing trend in the graph suggests vaccine priming, or vaccine-mediated enhanced disease (VMED), such that subsequent booster doses are incapacitating even more people than prior doses did.
For perspective, the maximum recent weekly excess death per million for seasonal flu is Week 2 of 2018 in the USA, when the pneumonia & influenza weekly death rate was 22 weekly deaths per million.
That level of excess death is approximated by the January 2021 excess death (orange line) peak at left in the graph. But subsequent peaks in weekly excess death per million — after even more vaccine doses had been given out — reach much higher than what is seen with flu.
In three cycles of heavy vaccination, Israel went from having just flu-like excess death (23 WEDpM) to something more than twice as bad as that (50 WEDpM) — indicating vaccine-mediated enhanced disease (VMED).
Reference
OWID vaccine data. “Total COVID-19 vaccine doses administered per 100 people” https://ourworldindata.org/covid-vaccinations
OWID excess death data. “Cumulative excess deaths during COVID-19 per million people” https://ourworldindata.org/excess-mortality-covid