Google loses more advertisers over hate videos
http://money.cnn.com/2017/06/07/technology/google-youtube-hate-videos-isis/index.html
YouTube users have to know what kind of ad shows before what they want to watch depends on what kind of website they've watched. And, what they are watching is also their chosen by their intentions.
So, I think that it's not on YouTube, but on YouTube users.
Furthermore, as long as all the companies want to pull their ads from inappropriate movies, YouTube has to broadcast inappropriate movies without ads. Is it possible?
So, Inappropriate movies will be deleted, due to YouTube's financial problem.