There are so many stories of white on black atrocities that are unassailably true, it's pointless to pad the accounts with stories of dubious reliability. It cheapens the gravity of the the ones that actually happen. As Shetterly points out, there was intensive documentation of lynchings and other atrocities by black investigative reporters, and we have exact statistics of the number of Lynchings per year by race and by state.

http://law2.umkc.edu/Faculty/projects/ftrials/shipp/lynchingyear.html

https://www.statista.com/statistics/1175147/lynching-by-race-state-and-race/

There are photographs and newspaper articles showing black bodies horribly maimed while happy white people look on and collect souvenirs from the bodies. And yet, somehow all of this careful investigative reporting didn't manage to find a single case of babies used as alligator bait. By far the most likely explanation of this is that it never happened.