Neither MBS or Saudi Saudi Arabia are our friends. He isn’t really trying to do anything about corruption. Read this and it might give you another viewpoint:
https://www.lewrockwell.com/2017/11/no_author/how-broke-is-the-house-of-saud/
I’ve read a tremendous amount about this, and I totally disagree. Trump is involved with this.
MbS is not the old Saudi type of man, he wants Islam reformed. Things change, and Trump is a catalyst and is supporting change in the ME.