We can hope that America will be kinder, more graceful, more compassionate, more sincerely devoted to all people being created equal and entitled to life, liberty, and the pursuit of happiness. But the truth is that celebrating the death of other human beings because we hate them or what we think they stand for is absolutely American.
We have let school shootings in America persist long enough that we have created a culture where kids grow up seeing them as a path towards fame and glory. Another consequence of how thoroughly the internet has flattened pop culture, politics, and real life violence. All of it now is just another meme you can participate in to go viral.