All you would have to do is look up what the vaccines listed as their efficacy rates. For example, Moderna said theirs was 94% (
CDC: Pfizer, Moderna vaccines 94% effective in health care workers | AHA News).
Then you could just subtract those numbers from 100%.
Then it would be obvious to you that some vaccinated people were still going to get sick. Maybe 6% to 8%.
You could then look at the readily-available stats that show that over 97% of the people getting hospitalized and dying are NOT VACCINATED.
Then you could put two and two together.
But I don't expect you to put forth that effort.