Compounding this is the aforementioned conundrum that when you fill out the gaps in "In 1987, $person met _____ in _____" with random but not implausible values you end up with a gazillion wrong assertions and (maybe) a very short list of accidentally correct ones. So even if a troll would like to tell the truth but enjoys peppering discussion threads with many low-effort comments just so someone will interact in whatever which way with them, none of their comments will likely be factually correct. It's like a multiple choice but it's not one out of four, it's one out of a billion answers, almost all of them wrong.

Brandolini's law (or the bullshit asymmetry principle)