Dave Bonta's "Noon people" is a tiny poem, and its brevity is part of how it works. The title points to people seen at midday, when the sun is highest and shadows shrink, and the poem pictures them as almost motionless. They "make nothing" and "seem not to doubt." There is no busyness here, no worry, just a calm that looks like certainty.
The speaker watches from outside, and the final line admits a simple affection: "I love to see them." The comparison that comes just before it, "as quiet / as a ruin," is the most striking image. A ruin is something once built and now still, worn down but not gone. That gives the people a slightly strange, ancient dignity. The word "seem" also matters: the speaker can't know whether they really lack doubt, only that they appear to.
The mood is hushed, bright, and admiring, with a faint wistfulness. The speaker seems to envy a peace they only observe.