What about the 2nd booster? LOL! Haven’t needed any of them. Sometimes I’m amazed at how many folks buy snake oil. Willingly, and go back for more.
“No amount of evidence will ever persuade an idiot(s).” Mark Twain
Well according to the Moderna and Pfizer it requires 2 initially.
As for the Johnson & Johnson you are correct the 2nd and 3rd shot of the exact same shot is an indication the shots are failures.