What makes you say, that the bombing of Coventry was "probably an accident"? There was repeated, and clearly well planned out bombing of the city between 1940-1942 [1].
It was not a remark intended to excuse the Germans. There is some evidence, which I am admittedly struggling to find a citation for at the moment, that the early 1940 raids were generally intended to hit military targets and the Germans just weren't good enough at bombing to be that discriminate.
Later on of course both sides were hitting civilian targets deliberately, and using incendiaries and high explosives. But it's possible the British were the first to do it deliberately, in retaliation for the Germans doing it accidentally (which they naturally did not believe).
Later on of course both sides were hitting civilian targets deliberately, and using incendiaries and high explosives. But it's possible the British were the first to do it deliberately, in retaliation for the Germans doing it accidentally (which they naturally did not believe).