They all talked about it.
"Empathy" must have been market-tested, polled, and sampled to undecided voters to determine what message would hit hardest against Trump and in favor of the Dems.
We are to believe that Donald Trump lacks empathy for the American people. We are to believe that Republicans and their mean-spirited, free market, capitalist policies leave the American people feeling that the party of Lincoln doesn't care about them or their needs or their feelings.
It's like the inverse of Ben Shapiro's catchphrase embodied in the entire raison d'etre of Biden's candidacy.
If you're to believe the Democrats overwhelming "Empathy" messaging this week, caring about your feelings is really the only value that is paramount for presidential leadership, and neither facts nor policies really matter.