Even though being the victim of a hacking attack is not (always) the fault of the account / blog owner , the blog owner may have to bear some of the responsibility. Since hacking detection is a fuzzy process, it's not always going to be detected immediately. The previous article discusses what happens when Google does detect a hacking attack - and in some cases reacts too diligently. If Google is not able to detect an attack, in some cases, an attack may be successful.
What Blogger won't tell you