This sounds like a theme park to me, which was exactly Scorsese's point.
this is a laughably bad example. successful art at its best can reveal something new about yourself or the human condition; it can make you feel emotions that you don't even have words for.
overcoming self-doubt is something we teach children.
With that said, my counter point was mainly to point out that you boxing in Scorsese as the "mob" guy is really bizarre. He has plenty of other kind's of movies, some of which you might find uplifting. The Aviator, Silence, or Hugo might fall into the uplifting category, but I feel a lot of his work (and the work of good artists) ends up being more nuanced to the point where associating one emotion to it is kind of diminishing the work.
Scorsese doesn't understand this because he likes mafia movies; not the type of universe you want to live in. Mafia movies are about taking a peak into a grimy sort of world that we all know exists to some degree but don't want to be part of ourselves.