Why doesn't YouTube show the dislikes count?

For videos YouTube displays the "like" count but does not display the "dislike" count. They used to. I know this happened a while ago (years ago?) but I never understood the reasoning behind the change. I thought it was useful to know both counts. The dislike count never stopped me from viewing a video if it was something that interested me.

Does someone know the reason behind the Google decision? Or give me your opinion, pro or con.

My opinion about the reason why? $