Well, the Tanakh doesn't say Ishmael was a maniac...
But the Pali Arabs are...
What's the "Tanakh"? (please excuse my ignorance!)
"Isaac and Ishmael"...I only meant that they were brothers and each branched off into what many consider good and evil (Judaism vs. Islam). Brothers from Abel/Cain, Isaac/Ishmael, Jacob/Esau, etc., have been killing each other forever, I guess!