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Sounds like the tolerances weren't big enough! Odd interaction putting those two paragraphs next to each other. NTSB demanding zero margin for safety...
Not zero margin, zero tolerance in the margin. Very different things. If you have a margin of error of 200, and each side has a tolerance of 100, both can be technically in tolerance but still collide. You want that margin to be larger than the tolerances combined, plus additional margin for human error and real world conditions. And then, if possible, double or triple that.
The altitude systems being able to be 100 feet off while at low altitude and a separation of 75 feet is absolutely insane.
Right. I know my friend in civil engineering plans bridges as if they have 18 wheelers stacked end to end, fully loaded across the bridge, and then doubles that number. I think he's mentioned other types of projects use safety margins of three or five multiples.