Seaeagle 109,
No I don't think the comments are harsh.
There's been no explanation of hacking, no explanation it is to become a matter for police investigation due to a cyber-security breach. Whilst the Jetgo management may not share the views contained in the email's content, its grossly inadequate to be simply appalled and embarrassed.
How does a person become unauthorized?: their initial authority is rescinded. An outsider therefore, whom never was a member of the organisation, & thus never held any authority, can't, by definition, be regarded as an unauthorised person.
In a nutshell, its not a hacking issue!