I believe the issue is not the invasion itself but what they did/didn't do after they "won".
It's indeed sad to see no good side/party. Just a mess that brought a lot of misery.
Unless an explicit claim to hegemony is involved, when a party isn't part of the country involved, we normally don't say "civil" but instead "proxy" warfare.
As CIA and the Pentagon support different sides in Syria, does this imply they're likely running offensive ops against each other? Do black (psywar) black (hat) hackers have any sort of IFF to prevent blue-on-blue?
(for a different blue-on-blue scenario: what might the cyber equivalent of leaving a grenade pin on an officer's pillow be?)