The left-leaning New York Times editorial board said that those who committed political violence and harassment in recent days are "responsible for their own actions," even as some others in the news media have attempted to make President Trump responsible.

The paper said Sunday night that the Pittsburgh synagogue massacre on Saturday and the suspicious packages mailed around the country to high-profile Democrats last week might have been more forcefully condemned by Trump, but that he was not personally to blame.

"The suspects in Pittsburgh, Florida and Kentucky are responsible for their own actions," said the Times. "Maniacs have always existed in dark crevices of American life, and no amount of public condemnation will ever stop them from developing poisonous ideas. But in this harrowing time, more good speech, from more good people, can remind other Americans of the sorts of values that have, so far, managed to contain the divisions in their country, of the moral imagination and empathy that Mr. Bowers evidently so feared."

[Opinion: Evidence not required for media to link Trump to suspicious package bombs]

The Pittsburgh shooting resulted in 11 deaths and several more injuries. The suspect, Robert Bowers, is an anti-Semite who believed Trump was too closely associated with Jewish people. The Kentucky incident occurred Wednesday when a white man, Gregory Bush, shot and killed a black man and a black woman.

Cesar Sayoc Jr. of Florida was arrested last week and charged in relation to the more than a dozen potential explosives delivered to the homes and offices of Trump critics, including CNN's offices in New York, former President Barack Obama's home in Washington, and the California office of Sen. Kamala Harris, D-Calif.

Trump on Friday condemned the package deliveries. "These terrorizing acts are despicable and have no place in our country. No place," he said. "We must never allow political violence to take root in America."

On Saturday, he also condemned the Pittsburgh shooting, calling it "anti-Semitic" and "an assault on all of us."

[Also read: Obama, the Great Divider when in office, lacks the credibility to lecture America]