Unless there's evidence that all of it was fact-checked, it's a waste of time to look harder. You can get any output you like, it doesn't mean it's correct.
Humans exercise judgement.
At least when humans lie they're usually doing it on purpose. When machines lie they don't know they're doing it.
They lie more unpredictably.
For some reason, some people repeatedly defend machines that constantly do the same thing, and claim we should give it the benefit of the doubt.