The rather beautiful explanation is almost certainly that both trends ride the same economic wave. When the economy contracts, people trade steaks for Spam (a perfectly sensible move that saved American dinners during the 2008 crash and its aftermath), and simultaneously, desperate financial circumstances correlate with drinking problems, substance abuse, and riskier driving. Add in population growth—more people means more Spam eaters and, depressingly, more opportunities for impaired driving—and you've got two separate but very human responses to the same underlying pressure. Between 2010 and 2022, Spam sales fluctuated between roughly 20 and 30 million pounds per year, a number so large it's almost impossible to visualise, though if you stacked that much Spam end-to-end it would reach, well, I'm not sure, but it would certainly be enough to make anyone reach for a drink.