Blitzkrieg, the Nazi's war plans, revolved almost entirely on carpet bombing civilians. You can't just gesture at a single atrocity and pretend the allies were just as bad.
Also, if someone replied to that post by saying something like "Cwmparc bombings. Ring a bell?" He'd probably start about how you have to make tough choices in war so that's why the Luftwaffe had to drop all their bombs on a bunch of orphans and the farmers that took them in.