While the ruling class had long-standing interests in undermining their “extracted duties” under the social contract, the oil crisis gave them a plausible narrative and a set of conditions that made such changes appear more justifiable and less resistible shifting the narrative from away from collective welfare solutions and toward individual responsibility and market-driven approaches.
I kind of view it as the oil crisis serving as a stress test that revealed the fraying unity and decreasing mobilization capacity of the general populace which occurred alongside broader cultural and political shifts in the 1970s that coincided with a decline in trust in institutions (partly due to events like the Vietnam War and Watergate).
But yeah, a reason, an excuse, I meant the same.