Vice President JD Vance issued scathing words to those questioning the motive of Turning Point USA founder Charlie Kirks accused killer on "Jesse Watters Primetime" Wednesday.After citing several sources involved in the investigation, the vice president blamed Kirks killing on "left-wing political radicalization.""My friend is dead because of left-wing political radicalization," Vance argued. "And if you want to cut that sh-- out, then be honest about it, and look yourself in the mirror."JD VANCE DECLARES THERE IS 'NO UNITY' WITH PEOPLE WHO CELEBRATE CHARLIE KIRK'S ASSASSINATIONAccording to court documents, the mother of Tyler Robinson, Kirks suspected assassin, said Robinson had "become more political," leaning left and supporting "pro-gay and trans rights."On Tuesday, Utah County District Attorney Jeff Gray read aloud Robinsons alleged explanation in text messages to his transgender roommate for assassinating Kirk."I had enough of [Kirks] hatred," Robinson wrote Sept. 10. "Some hate cant be negotiated out."Robinson has been charged withaggravated murder and six other felonies by Utah prosecutors, who intend to seek the death penalty.CHARLIE KIRKS STRONG STANCE ON DEATH PENALTY RESURFACES AFTER UTAH ASSASSINATIONAs the nation debates Robinsons alleged motive for killing Kirk, Vance told Fox News host Jesse Watters the conservative activists death is not a "both sides problem.""You look at every ounce of evidence that we have, and it is clear," Vance said. "This is a person who grew up in a pretty normal family, actually had a pretty good home life, who was radicalized by the far left, by the social networks of the far left, by the ideas of the far left, and got so far down the path of radicalization that he killed my friend."The Republican vice president also addressed whether the firings of those celebrating Kirks assassination is constitutional as employees lose their jobs and college students face expulsion for praising Kirks death.JD VANCE PENS HEARTFELT TRIBUTE TO CHARLIE KIRK AFTER ASSASSINATION: YOU RAN A GOOD RACE, MY FRIEND"The First Amendment protects a lot of very ugly speech," Vance explained. "But if you celebrate Charlie Kirk's death, you should not be protected from being fired for being a disgusting person."When Watters asked Vance how he views the celebrations, Vance listed a couple of questions he would ask the "disgusting" people in question.CLICK HERE FOR FULL COVERAGE OF CHARLIE KIRK'S ASSASSINATION"I would ask if you were the kind of person who feels joy at the death of a grieving mother and grieving children, what bad decisions have led you to where you are today?" Vance responded. "And why don't you get back on the right path?"On Monday, the vice president hosted an episode of "The Charlie Kirk Show" in honor of his late friend, saying he would not be in office without Kirk.VICE PRESIDENT JD VANCE ESCORTS CHARLIE KIRK'S CASKET BEFORE FLIGHT ON AIR FORCE TWO FROM UTAH TO ARIZONA"Obviously, the president makes the final determination, but it takes a team effort, and Charlie was part of that team," Vance said.Vance also served as a pallbearer for Kirk when he carried his casket onto Air Force Two in Utah. The plane transported Kirks remains to Arizona Sept. 12.CLICK HERE TO GET THE FOX NEWS APPTurning Point USA will hold a memorial for its founder in Arizona Sunday at State Farm Stadium, home of the NFLs Arizona Cardinals.