People really overestimate craftmanship that it takes to create luxury goods. Good marketing on tue part of the luxury companies. But they are still made by people in a mechanical fashion. And talents are evenly distributed around the globe and people everywhere have been working with leather for centuries, not only italians etc. The ability to learn and mimic is how humankind have evolved to the top of the foodchain.
I really don't understand how people disbelief the fact that others can copy 100% correctly. Even paintings have been forged and for that there are numerous factors like the ink, canvas etc to be forged. Forging a bag, which essentially is a mostly mechanical skill that with enough practice you can master quickly, when the same input as authentic (leather, thread etc) are plentiful to buy, is very easy.