Well Davis was a communist and a pervert, so he would be an embarassment to have as a father. I’m still not sure how Martin came up with this. People on FR have been guessing this for weeks based on pics of 0’s father and Davis.
Frank Marshall Davis was born in Kansas, like the Dunhams. After moving to Chicago he started a photography club. He was also the author of a pornographic novel. This explains the pornographic photos of 0bomba's mama. 0bomba like Frank wrote bad poetry. Being a registerd member of the socialist "New Party", 0bomba shares many of the same views as Frank and the Communist manifesto.