Earlier quoted context omitted.
>the compromise of an account not held by him puts him clearly into the "black-hat" category. That's not what "black-hat" means.
Yes it does. Gain unauthorized access to an account and using it falls under pretty much any standard definition of "black-hat" and in practical terms breaks computer security laws in pretty much all legal jurisdictions which have them.
>Gain unauthorized access to an account and using it
Screw the motivations or the ends! The means are ALWAYS bad!