Comment by buellerbueller

Hypothesis: The American diet contains more carcinogens (dyes, additives, pesticides, supplements in poultry/beef/pork) and therefore USA is is more need of CRC screening.

USA generally has higher CRC rates than other developed nations:

https://pmc.ncbi.nlm.nih.gov/articles/PMC2796096/

the screenings may make sense, here