That’s a complete lie. Trump has not been encouraging people to stockpile arms, compile hit lists, or commit acts of mass terror.
He has been calling out the press for its bias, loss of journalistic standards, and its inaccuracies. He has not been calling for terrorists to kill his political opponents. He is no more responsible for this extremist than Bernie Sanders was responsible for the shooting attack that injured Congressman Scalise.
There have been numerous physical threats against Trump and his family and his administration made by Left Resistance favorites, from comedians, singers, and actors. Some people find these direct exhortations to violence funny.
Trump has not encouraged violence. Some of his opponents have.