Why do I know that Highland Park, Ill., was the backdrop for “Ferris Bueller’s Day Off,” a 1986 John Hughes movie starring a young Matthew Broderick as a cheeky teenage suburbanite who misbehaves? It’s because so many articles recounting the horrific Fourth of July shooting at the town’s annual holiday parade mentioned it.

The reference was used as an emblematic totem, shorthand that tracked the comments sprinkled through the articles and tweets launched that day: “probably the last place we would expect this” or “just inconceivable in a community like Highland Park.”

I mourned along with the country at the heartbreaking details, the child left without parents, the grandfather in an extended family, now left without its patriarch, the mother hit as she ran with the daughter who saw her go down but who kept running to save her own life.

Will this country ever be rid of the senseless gun violence that stains a quintessential Independence Day celebration, with marching bands, floats and children toted in strollers and wagons? Will there ever be a consensus that pushes politicians to change laws that allowed a 21-year-old suspect to obtain authorization to purchase weapons at an even younger age, with a co-sign by dad, even after incidents that drew law enforcement to the home?

Apparently not until America decides enough is enough and makes elected leaders pay a political price, which has not yet happened.

But while I mourned, I also realized, and not for the first time, that Americans mark tragedies in different ways, with wide-ranging levels of empathy, that deeply felt emotion that allows you to look into the faces of those whose lives are forever changed by violence and feel the same pain, maybe because those people remind you of you.