Circling back to this, because I think it's important to interrogate not only this statement, but what it says about the Kents, the Els, and the movie as a whole.
What is Clark's most defining feature in this movie? Now the words say kindness. They try to jab that into your skull. But it's not. It's his action. That he engages. He doesn't sit on the sidelines. Where does he get this from in the movie? The Els. He tells us that what motivates him to do what he does is the message he believed his parents sent with him.
We now know that the cake is a lie. So what are we left with? The Kents. Who apparently disengage, stay offline, and just hang with their farm animals. They don't sound like they show up for Pride. No civil rights marches for them. 50/50 chance they don't even vote blue. How would they even know to do so? They're disengaged. Busy living the slow, innocent life while everything is going to hell. I don't even think they call their son once he's in crisis.
So how exactly are the Kents the "good parents" here? They didn't teach their son to step up. To stand up to injustice. They don't do it themselves.
People love to clown on MoS, on Smallville. But they at least get the basic dynamics for both the Kents and the House of El.
I think the gist of the Kents’ goodness, or how we should perceive them in the context of this film, is through Clark’s actions & morality as Superman. The Els told him they searched for a place where he can do the most good. The Kents showed him what good is.
Even in Jonathan’s talk with Clark, he says how proud of him he is—specifically, of his choices & actions (and the man his son has become). So all this kindness & compassion Clark has either displayed thus far in the film (saving citizens, saving a squirrel, his handling of the kaiju, stopping an invasion despite political optics, searching for Krypto, etc.) or been alluded to by reliable sources (Lois tell us he sees
everyone as beautiful) is co-signed by Jonathan in that moment.
Whereas Kevin Costner told his Clark to hide who he is, instilling fear of revealing himself to the world & the ramifications that would bring. And, later in his career (in case the argument would be that Jonathan was speaking to his young son in that moment), Martha encouraged Clark to walk away from it all, saying he doesn’t owe the world anything (in BVS). In this film, even after turning himself in to the US army (and subsequently breaking out), Jonathan doesn’t show fear or anger towards humanity on his son’s behalf—he’s proud of his son, reaffirming the choices Superman has made (which we’ve seen to be compassionate).
We don’t see the Kents themselves being overly good onscreen, sure, but they
raised Clark. And since we don’t see him rejecting them or denouncing them at any point (
or moodily hitch-hiking the country as some drifter), we can assume some of that empathy & self-assuredness came from his upbringing & family. I will concede, however, that for the amount of TV reaction shots we got to the Els’ message on the news, it would have been nice to see Ma & Pa watching along with the rest of the country. And a phonecall (only to show Clark’s cell-phone, unanswered, at his desk or his apartment) would have been nice too. The perils of a short runtime, but we’re talking 30 seconds here.
And I don’t get the sense they’re offline, either. They’ve got cell phones; they had the news on the TV. They even tried burritos at that restaurant with their friends!