However, as soon as France developed its own air power, they began similar attacks against German cities. For France, it was a matter of survival given the front in their Eastern lands.
Britain held off because they found the idea of bombing innocent civilians to be offensive. They held off for two years before deciding that they had no choice.
By 1919, it was Germany who had had enough - this was the shopkeeper's argument. It just wasn't worth it. In that year, Germany proposed a mutual agreement to stop the assaults on innocent civilians from the air.
History teaches us a lesson.