Poor people were not hidden away, it's just their lives weren't that beautiful to be shown and paraded around.
But over the years I have come to realise that I'm very odd.
When you go on holiday, how many photos do you take of regular people, vs. tourist attractions? Or, in reverse, do you know regular people[1] who often find tourists visiting their area like to take photos of their homes?
[0] When I visited Nairobi a decade back, one of my photos was along the lines of this Google Street View image: https://www.google.com/maps/@-1.2811367,36.9148575,3a,75y,17...
[1] This site being what it is, there's a decent chance you know someone world-famous and people do actually want photos of their home. They're not "regular people".
The same during the Korean War he was a pilot in.
It isn't like we don't have records of ordinary people, even the homeless, or criminals. It's more like people like you claim the existence of a whole another kind of "poor people", who were supposedly the absolute majority, who suffered somewhere, completely ignored by everybody, and worked long hours every day on... being poor? It just doesn't seem to add up.