By Lawrence Hurley WASHINGTON (Reuters) - Two U.S. Supreme Court justices from opposite ends of the ideological spectrum are calling on Americans to learn to talk civilly to each other or risk lasting damage to the nation's democratic system. Speaking in a pre-recorded discussion released on Wednesday, liberal Justice Sonia Sotomayor and conservative Justice Neil Gorsuch both bemoaned the current state of public discourse, which they said was abetted by the spread of disinformation on social media. The United States in the past year has endured a contentious presidential campaign, former President Donald Trump's false claims of a stolen election, an attack on the U.S. Capitol by a pro-Trump mob and police incidents that triggered protests against racial injustice.