Walz clearly does not have the temperment to be the president, which means he should not be anyone's choice for vice president.
He enjoyed the status of being a Command Sergeant Major, even if he was not really one, but was yanked into the position as an "acting" and never met the requirements. But when his unit was to deploy, and his troops needed their senior NCO as much or more than they needed their commander and other officers, Walz saw that this might hinder his career, especially if he died in the deployment.
So, he yanked himself out of danger.
He yanked his own son because the son was not standing close enough to suit his father's desire for a family photo op. That kind of controling nature, and willingness to use force is a trait of a person on the autism spectrum.
Give him control of the Department of Justice and sixteen other intelligence agencies and see how he yanks political opponents.