Why do you think that means that it wouldn’t be done? I understand your reasoning but it is far too civilized.
It depends on how you do it and whom you use to do it. You seem to assume that they will be using the traditional method used by people who plan on coming home after the war. They won't. Instead they will find suicidal volunteers to fly planes loaded with gas, bugs or bombs to several targets. If only four or five hit we are talking about potentially millions of lives.
If volunteers are not forthcoming then you just grab a few pilots’ families. After they watch you cut off a couple of ears they will fly the planes.
a.cricket
I am not referring to those dedicated and brainless servants of Satan who do the actual transporting and detonation of such devices.
I am referring to the power behind the attempt. Goldfinger, Dr. No, Saddam, whoever. He would have a lot of company, uninvited guests, very hungry and annoyed, and very quickly and soon.
I am saying it can't be done in a general attack. It will be discovered and it will fail. It can be done on a small scale, but all that would do is in effect poke a hornet's nest. No sane madman would bother with such a scheme.