Because Hillary lived in the White House - had access to the concepts of 'classified information' I don't believe the 'reasonable person' concept applies. She would be held to a higher standard.
Hillary was head of the State Department.
She knew the risk of an unprotected computer ... knew the rules, knew why the rules existed. Leaving classified documents 'open' to our enemies was a known fact to her... She knew her actions constituted a danger to the security of the country. She might be a traitor.
It couldn't be phrased any better. She was in authority, she was a person who set rules and formulated policies and demanded that others adhere to those rules and policies, under threat of severe criminal and/or civil actions. As others have pointed out, because of the position she held, she had to be absolutely above reproach.