Speaking of "TV drama levels of understanding of criminal justice"... :)
With only a few exceptions, persons accused of crimes are not presumed to have mens rea. Statutory rape, for instance, has "strict liability"; even if you don't know you're committing a crime, you're liable. Most criminal offenses are not like this. The state is required to establish mens rea.
A prosecutor could say that a ToS-infringing blog comment is a criminal violation, but unless that prosecutor can establish that the comment was made in purposeful, knowing, or reckless violation of the ToS, they'd be wasting their time.
With only a few exceptions, persons accused of crimes are not presumed to have mens rea. Statutory rape, for instance, has "strict liability"; even if you don't know you're committing a crime, you're liable. Most criminal offenses are not like this. The state is required to establish mens rea.
A prosecutor could say that a ToS-infringing blog comment is a criminal violation, but unless that prosecutor can establish that the comment was made in purposeful, knowing, or reckless violation of the ToS, they'd be wasting their time.