I remember reading that when firearms became an accepted weapon with which to commit suicide in Japan, the proper/honorable way to employ a firearm for that use was to shoot oneself in the heart--not in the head.
If true, then Tojo was attempting to follow a code of conduct, not trying to spare his profile.
I noticed that in TV’s “Letters from Iwo Jima” the Japanese commander shoots himself in the chest with the .45 Colt given to him by American colleagues in happier times. I stand corrected about a head shot.
But I recall now a WWII photo of a Jap soldier who committed suicide with his rifle thus: “he removed his boot, stuck his big toe in the trigger guard, and fired the bullet into his chest”.
C’est la guerre......