Aren't most holidays - if one tries hard enough - built around something bad happening to someone else? Independence celebrations are based on one side wounding/damaging/killing another side; religious ones quite often involve goriness of some sort or signify the start of fighting/misunderstanding/ etc; memorial holidays - well something bad had to happen for people to have to be reminded to remember; mother's days/father's days etc - some had good parents and some had terrible ones.
I think people can spend too much time trying to figure out ways to be offended/identify as victims.