And how many case have we had from Bunnings and Coles ?
" In bunnings or coles wow etc infected can simply adjust mask in store then inspect an item put it back, mask and PPE not 100% barrier as medical personnel have proven time and again "
That's exactly why you need multiple levels of protection . Particularly for people that aren't trained in the use of PPE or a bit slack. You might be doing the right thing and someone might not. That means that you are still protected despite the other person's mistake.
People make mistakes. Even health professionals slip up. The difference being that the health professionals are exposed to known cases constantly. Going to Bunnings is a much lower risk environment.
