"... any set of ideas that schools are going to teach kids about the nature of science, or truth, or justice, or fairness, is coming from a worldview perspective."
There is a sense in which this is, of course, simply true. There is a 'worldview perspective' underlying anything we might teach our kids.
However, there is another thought that often goes along with this truism, one which @Rudderneck seems to accept. It is that our 'worldview', being in the nature of things, one among many, has no greater claim on veracity or utility than any of the other available 'worldviews'. This is a mistake, and a bad one.
Why? Because this 'worldview' works. The science we inherited from the seventeenth century empiricists has given us antibiotics, vaccination, hybrid maize, streetlights, safe lifts, world trade, paperback books ... and so on and on.
Justice and fairness may still need some work (although some may think there has been progress even there over the last three hundred years or so, at least in some areas) ... and of course however useful our science is there still may be questions about the wisdom of some applications thereof. Nevertheless, the 'set of widely held ideas about reality' Rudderneck mentions, which we 'take for granted', including, for instance, ideas about the mechanics of the universe and technology based thereupon, whilst perhaps indeed not self-evident (some early responses in seventeenth and eighteenth centuries will convince a reader of that), nevertheless work.
You want to go to the moon? You want a polio or covid vaccine? (And so on.) Try using any other 'worldview' than our scientific 'widely held ideas about reality'. Magic crystals? Gender identity? Ghosts and demons? Gods and devils? Substances, accidents, real essences, matter and form? Huh. Good luck. See how far you get.
No, Rudderneck, any 'good faith school', if it is to be any use to its pupils, must teach the same 'widely held views about reality' as other good schools, at least in its non-faith-based lessons.
It can't be really true that there is no real truth. Do you see why, Rudderneck? And do you see how this undercuts your own brand of relativism?