Well, there is always the possibility that a certain amount of those reviews are from salty players or kink-shamers, who gave 1-star reviews just because of a disliked tag *cough* NTR *cough*.
Don't look like that, you know it's true, you can always find 1-star reviews whose only conclusion is: 'I hate NTR!' or 'The dev is a dick!'
Of course, this also goes the other way, 5-star ratings because.... well... just because... maybe that one girl was cute?
Then some reviews may be from early (bad) versions and has never been updated.
On top of that, most reviews are either 5-star or 1-star because many people don't consider gradations in their ratings.
If a game is bad, people will complain, especially when there is also a controversy, this causes traffic and this keeps the thread "hot", which keeps on drawing views.
Oh, and of course updates always reignite these discussions.
Besides, it's not uncommon for bad stuff (headlines, games, movies) to attract curious people who want to know if it's really that bad.
And if a certain amount of views is reached, this alone is already enough of a motivation for people to take a look.
This is one of the reasons why some pointless and uninteresting videos on Youtube have so many clicks.