Any person who commits a crime on behalf of their employer can and should be held criminally liable. That the employee was instructed to do so by his manager will not prevent his conviction, it will only be evidence that the manager should also be held criminally liable.
Veil-piercing is relevant when the business is insolvent or can’t pay the judgment. So the corporate entity isn’t protecting the business in that case.
Re Wells Fargo, would you hold ordinary shareholders who do not participate in the management of the business liable for debts of or crimes committed by Wells Fargo?