I think the most natural reaction to a liar is to turn away and reject the dialogue. But Walz had to show that he is willing to reach across the isle. Just as with the fracking and the gun ownership he communicated "I am eligible if you're Republican." Vance tried to reframe "Yeah, maybe Walz seems okay but he works for evil stupid lazy Kamala." Everything was Kamala's fault and every problem from School violence to inflation to house prices could be solved by kicking immigrants out.