Despite the absence of any knowledge of who bombed the Boston Marathon and why, The Post used a quotation from an anonymous White House official, describing the event as “An ‘act of terror’ ,” as its lead April 16 front-page headline.

Most people’s perceptions of a horrible event are formed in the first hours of its occurrence, regardless of what subsequent investigation ultimately reveals. Why try to set opinions before the facts are known? The Post’s rush to judgment in its choice of headlines was irresponsible.

Mark MacCarthy, Washington

The Post reported that “The last mass terrorist killing on U.S. soil was carried out by Maj. Nidal M. Hasan, an Army psychiatrist, who fatally shot 13 people and wounded 30 more at Fort Hood, Tex., in November 2009” [“A nation on guard can’t stop every plot,” front page, April 16].

Really? What about the shooting of Rep. Gabrielle Giffords near Tucson on Jan. 8, 2011? Eighteen people were injured and six died. Or the mass killing in an Aurora, Colo., movie theater on July 20, 2012? Twelve were killed and 58 injured. Or the 26 children and adults killed in Newtown, Conn., on Dec. 14 at Sandy Hook Elementary School?

It is not “terrorism” only when the perpetrator has a foreign-sounding name or connections to radical Islam. Indeed, the majority of terrorist incidents in the United States are homegrown, and those who most often wreak the terror are U.S. citizens.

If we are to address the issue of violence in our country, a first step is to understand it.

David Elliot, Washington