There's the modern news-cycle axis, where Google can and should devote full-time engineers.
But the long tail is important too. It's fixed now (yay) but for years you could search for "calories in corn" and Google would confidently present an answer 5x the true value, scraped from a site with profoundly wrong information. As Google moves to present more direct answers and fewer links, this risk increases.
It looks like they have backed off on the direct answers somewhat which is good news.
Google lends the weight of its authority to the answers it presents. It's one thing if Infowars says that Obama is planning a coup against Donald Trump, it's another if Google says so.
Here is an idea: make it a standard practice for hosts to publish the a "we do not discriminate" clause in their listing. Maybe even provide a checkbox that adds that boilerplate.
I'll bet most people prefer to rent from hosts that say they don't discriminate.
Of course this won't solve the problem, but for hosts like the one our blogger found, it will at least tug on their conscience.