Notwithstanding Hillary Clinton’s ultimate loss, the Democratic Convention was very successful. One of its most heartening and effective aspects was its embrace of the country, the flag, and our progress as a people. As envious Republican commentators noted, President Obama’s speech and the audience reaction had the optimism previously associated with Reagan.

Since the election, too many active in progressive politics denigrate American history and America more broadly. This has always been a trope of the extreme Left but it is in danger of becoming far more widespread. When one reads these posts, it sounds like America has never done right, never can do right, and never will do right.

Like many countries, America has deeply unpleasant aspects of its history. Europeans arrived not just fleeing persecution but also as part of a colonial enterprise that exterminated almost all Native Americans. Slavery was the original sin at the country’s founding and the maintenance of Jim Crow after its end continued it. One could also mention the Chinese exclusion acts and the internment of Japanese Americans.

But fear of the future as “American carnage” is Trump’s market. Democrats won’t win by hectoring the country on its sins. Few will vote for someone who comes across as thinking that the only proper way to observe Thanksgiving is a vegan apology dinner. Yes, George Washington and Thomas Jefferson were slaveholders and (gasp) white men but they also played critical roles in crafting the country’s democratic institutions and the ideals that many have invoked so effectively to bend the arc of history.

No immigrant comes to America because they hate the country—they usually have reason to be grateful for the opportunities and freedom it offers—so the negative approach also has little appeal to the rising Latino and Asian American electorate.

We should acknowledge the past but the emphasis needs to be more squarely on our progress and celebrating the great wonder that is America. No need to celebrate historical figures whose essential contribution was primarily negative, like John Calhoun or George Wallace.  We want to move to the future to continue our amazing progress, which allows us to acknowledge darker moments in our past but as part of a tapestry in which we continue to move forward hopefully and confidently by holding on to our best ideals.

Traditionally, Americans are big believers in the dignity of work. Being unemployed is felt to be shameful while anyone who works for a living, no matter how humble the job, can feel proud.

Republicans have corroded this view with an endless focus on the rich. People who work hard but don’t earn much are losers. Instead, we need to focus on the “job creators,” which seems to mean giving wealthy people ever more tax breaks and cutting basic services for average Americans in the manner of Kansas Gov. Sam Brownback.

Democrats have tried to take advantage of this with attacks on the rich but have often gone about it in ways that unthinkingly alienate the very people that they’re trying to attract. Many Democrats routinely describe all sorts of jobs as lousy for their low pay and status, or failure to allow much in the way of advancement.

Using McDonald’s employees or fast-food workers as bywords for jobs that stink unintentionally insults thousands and doesn’t acknowledge that these jobs actually require skills and ability to work under pressure. Calls for retraining workers and making it easier to obtain more education are laudable ideas. However, telling people that they need to do it so they can obtain “better” jobs comes across as patronizing at an incredibly stressful time, especially since many of the new jobs pay less than the lost jobs.

Parking attendants know that they work for low pay in a dark environment with too much pollution. For many in their situation, however, this may be as far as they end up going for a variety of reasons—not all related to lack of opportunity. They do these jobs year in and year out because it puts bread on the table and in the hope that their kids can do better. Even if they could use a helping hand, they want to retain their dignity and their respect.

There is a fine line between helping people improve their lives and denigrating the jobs they take to support their families. People who work in “lousy” jobs already know about the low pay and status. Just as they don’t need Republicans to tell them they’re chumps, they also don’t need Democrats saying their jobs are bad or somehow not good enough, which quickly gets read that they are not good enough.

A great part of Trump’s success was making whites who work these jobs feel respected in execrable identity terms that communicate that they are the “real” Americans and should come ahead of “those” people and snooty elites of both parties. Obviously, Democrats shouldn’t emulate this approach. A core Democratic belief is that we’re all real Americans.

But at the same time, Democrats have to find a way to communicate more respect for these jobs and the people who hold them. Democratic presidents from Clinton to Obama have heralded the many Americans who work two jobs to support their families, which is a good start though not a solution to this knotty problem.

It’s also not a quick fix for the bigger problem that many Americans feel that they are falling behind no matter how hard they work. The Republican approach now centers on gutting health care, tax cuts, and making Archie Bunker look tolerant, so Democrats have a real opening if they don’t unintentionally denigrate the voters.