Why is there no coverage of Dec. 2017 Israeli attack on Syria by the US media (except for UPI, VoA, RFERL, Newburgh Gazette and GKMen), according to Google News 11AM MDT, Dec. 2, 2017:
Because you shouldn't trust Google News as "full picture of all news". It's a black box with unknown algorithms (or alternately, you searched it the wrong way. I haven't used it in 3-4 years or more so no idea how good is its coverage nor algos).
Let's look at two of the biggest news source on US cable/web: CNN and Fox News
The very first story in the "Latest stories" section is... surprise... "Israel strikes military site near Damascus, Syria's state-run news claims".
The story is 11 hours old there so it's no longer top of the latest list, but: "WORLD 11 hrs ago - Syrian state media: Israeli missiles strike near Damascus"
So, the question's assertion that there was no US media coverage is patently false.
Because US Media has tons of stories to cover, and many of them are far more important to news consumers, at least according to media's judgement.
Main stories overall on CNN, Fox, and couple of others are all domestic big stories: Trump's tax cut plan passing the Senate; and Flynn-related stuff.
Main stories on world sections are North Korea. For obvious reason (Hwasong-15 is ICBM designed to hit USA).
Lastly, because US Government doesn't care much (I would speculate that they tacitly approve, but don't have any evidence) - so they didn't make any moves to highlight this news, like issuing statements / press conferences.
Again, this is about focus. Trump admin's focus is zeroed in on milking tax bill as a success story. Trump opponents' focus is zeroed in on Flynn story. Neither camp has any benefit from diluting their focuses at the moment with second-rate news that doesn't affect US domestic power balance in a meaningful way (or US geopolitical position, unlike DPRK's ICBM).