While we're talking history, could this book be kind of a "sorry" from Seuss for supporting Japanese internment during World War II? See, during the war, Japanese-American citizens were sent to internment camps because they were considered a "threat" to the safety of the United States. Yowza.
In Seuss's possibly parallel story, the jungle animals would the United States, and the Whos would represent the Japanese Americans. When the animals suggest something violent and horrible (like, you know, boiling the Whos alive) they claim that it's for the purpose of "restoring peace," even though the Whos haven't done anything to disturb anyone's peace (source). It's less whimsical when you think about it happening to real people, and not some imaginary Whos, huh?
Don't we all wish we had a Horton to save the day and reverse the clock on history?