Effective ban on lynching photos/postcards

IIRC the US Postal Service in 1908 placed a ban on ppl sending postcards which depicted photos of lynchings, but this restriction was never properly enforced and photos of such atrocities as the mutilation and burning alive of 17-yr-old mentally retarded black teenager Jesse Washington, accused of murdering the wife of his employer, in Waco May 1916, continued to be regularly sent in the mail on a largescale basis by white Southerners who viewed these events similarly to spectator sports and discussed lynching on a casual basis. There was 1 photo taken by a local Waco photographer of the entire gruesome spectacle (I think there were a total of 3 or 4 photos of the lynch-burning taken in all, including of the 5,000-strong crowd who'd gathered to watch, and the victim's burned mutilated body displayed afterwards from a utility pole with a bunch of prowd local bigots posing) which was on the WITHOUT SANCTURY website (http://www.journale.com/withoutsanctuary/main.html), and sold as a postcard (IIRC there was at least 200,000 postcards made from this photo), where the writer offhandedly stated to the relative he was writing to: "This was the barbecue we had last night" or words to that effect. I also recall either on this site or another that the sender acknowledged that ppl weren't supposed to send such violence-depicting materials in the mail, but he was doing so anyways.

Now, WI there'd somehow been a means for the Postal Service to effectively proscribe the practice of sending lynching photos in the mail, and punish violators ? What effect would such a properly-enforced ban have had on the practice and representation of lynchings and racial violence in wider American society, and esp the popular media in the South which celebrated and legitimised atrocities against African-Americans ? Would there also needed to have been other changes in wider society, such as lesser media justification of lynching and greater political activism by the NAACP and other civil rights organisations and their allies for a comprehensive federal anti-lynching bill ?
 
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