“These are targets because many have already been compromised.”
OPINION: These are targets because the jihadis still focus on these targets.
“The stories are endless...”
OPINION: Yes, they are. There are a number of individuals that have been arrested who are not jihadis, but did compromise systems (hackers, viruses, etc.) for other reasons than jihad.
Anyway, cyberterrorism (no matter who does it) is a threat.