The Empire had a population of >100 quadrilion, Alderaan killed about 2 billion people. That's a difference of 8 orders of magnitude (50 million), that's equivalent to killing ~140 earth humans. In relative scale, it doesn't come close to Hiroshima, it's closer to having bombed a large wedding.
Rather than comparing it to bombing a wedding, I think it's more accurate to compare it to destroying every trace of some micro-nation and then cleansing any plant and animal life native to that nation.
Like in this example, these books I have mentioned are not even a matter of opinion, they are such masterpieces, without which no list could be considered worth having.
You probably pissing up the wrong tree.