I believe the simplest explanation is that while all you need is a preponderance of evidence to sue in civil court, you need beyond a reasonable doubt in criminal court which is what is required to pierce the veil of the corporation.
Put another way, if I prove in a civil suit that you wronged me, that is not automatically enough proof to go after you criminally (which is likely what most people believe).
Put another way, if I prove in a civil suit that you wronged me, that is not automatically enough proof to go after you criminally (which is likely what most people believe).