Re "
culture stems from the top...all the way to the 'shop floor' ." Indeed it does and this is true of any & all human organizational behaviour. Take a look at Flight Safety Foundation Human Factors & Aviation Medicine, Vol.37 No.2, Mar/Apr 1990 entitled Orchestrating the Human Symphony in Flight Operations, authored by John Nance and still available @
https://flightsafety.org/hf/hf_mar-apr90.pdf
Whether a country, a band, a family, a classroom or an airline, people take their cues as to what is acceptable and legitimate from whoever is at the top; - from the behaviour and standards they demonstrate and what they tolerate and what they won't. That's where to put resources and that's also where to nip things in the bud, if that is the desire or the need. There are plenty of examples of this principle in our midst these days.