Closed-minded people want to get results that are accurate to their opinions, preferences, etc. The best way to make them satisfied is to re-use their search/browsing history and return results biased toward them. There is nothing wrong with that, we all do that in normal life to some point choosing people, events and places similar to us.
Open-minded people will always look for alternatives, they will like to see options, thus still looking for valuable information but according to different points of view. And this is why there are different newspapers on the market - some of them present the one and only vision of reality, others prefer to start a discussion about the real meaning of the facts.
And in the same way different search and recommendation engines will be enriched with such options, so we can have a choice. Otherwise we will leave looking for a service that does.