"Have you ever been or are you now involved in...."
'C. Have you ever been or are you now involved in espionage or sabotage; or in terrorist activities; or genocide; or between 1933 and 1945 were involved, in any way, in persecutions associated with Nazi Germany or its allies?
Ahhhmmm: Yes ? Who would acknowledge this in a freaking form'
It is a legal issue. If the people concerned are honest (very unlikely), they will probably be denied entry to the USA. If the people concerned lie (as one would expect), they will have committed an offence when they submitted the form. This offence allows them to be deported with minimal proof of involvement, whereas proceedings for more specific crimes might be more complicated and the outcome is less clear because their level of involvement may be relevant.