Not to be horribly pedantic, but
Bonsai (with an o and an s) are those really cool dwarf trees that MisterE posts pictures of now and again.
Banzai (with an a and a z) were Japanese infantry charges.......essentially suicidal and rarely succesful against machine guns and artillery
The tragic civilian suicides on were neither of the above; they were just tragic suicides.
Banzai were not always essentially suicidal in one strict sense of the word.
Our modern scourge, meth, was developed by the Japanese at this point in history and was used on the pilots to whip them into a frenzy before their flights.
I would posit that suicide is not just killing oneself, but doing so with the intention of destroying what is in one's own interest (as is used in the phrase "political suicide"). These pilots, just like suicide bombers, are not focused on killing themselves as much as damaging the opponent--their death is simply a side effect.
Not to be too pedantic or anything...but I do strongly agree with your observation that the civilian suicides are tragic, and the pilots are a different story.