I haven't exactly placed blame on the US government itself either, and I'm not exactly proposing a solution other than a slap to the back of the head for 330 million people, but to answer your initial question, yes, I do believe there is an obligation for the US government to figure a solution for the American people in light of this impending inevitability. It comes down to your fundamental approach toward government. If you subscribe to the thought line that the government is just here as a puppet that interacts with us and is meant to keep us down while ((((they)))) control and harvest us, fine, I get that and I could see why this is automation cliff is not discussed; desperation certainly let's you write the new set of rules any way you want. However, if we dial back the cynicism a bit, and go along with the thought that I think the majority of Americans carry around with them, that "we the people" allow the government to exist only for the betterment of its citizens, then yes, why would adverting an unprecedented economic disaster, and helping the citizens shift to lessen the blow, NOT be of paramount importance? Why would that not be something the US government should be focused on? The government are citizens too... All 22 million... The dichotomy of government vs private sector is exactly the type of thinking that needs to be dispelled in order to face this thing
You are running sprinting with this assumption that the Government was created for betterment of its citizens, and thus it should do everything in its power to alter the natural course of things. Automation and low-skilled labor going out of work is exactly that, a natural course of things to come. So when you are looking for a solution from the government, you are simply expecting the government to do something it must not, which is meddle with the markets. Government meddling with the market is exactly what has bought housing bubble, student loan bubble and the massive 20 trillion dollar debt.
Also how does the Government come up with a solution to this exactly? Forceful prevention of automation? More socialism with socialized college education?