The key issue is that any use case that sounds legitimate is still not really legitimate because, as a rule, it's illegal to operate a transmitter without a specific license and in almost every case the condition of that license is that you won't interfere with others.
The difference asserted in that quotes is essentially between "willful malicious illegal activity" and "negligent illegal activity", there's no reasonable possibility that it would have been a legitimate use - as far as I understand, simply importing that particular device would already be illegal - there is an exemption in the rules (https://www.ecfr.gov/cgi-bin/text-idx?SID=a230935ff03941152f...) for "Three or fewer radio frequency devices are being imported for the individual's personal use" but that only applies to specific categories of devices and would not apply to that jammer.
The difference asserted in that quotes is essentially between "willful malicious illegal activity" and "negligent illegal activity", there's no reasonable possibility that it would have been a legitimate use - as far as I understand, simply importing that particular device would already be illegal - there is an exemption in the rules (https://www.ecfr.gov/cgi-bin/text-idx?SID=a230935ff03941152f...) for "Three or fewer radio frequency devices are being imported for the individual's personal use" but that only applies to specific categories of devices and would not apply to that jammer.