It used to be that you could do these nuggets of a movie and it would attach itself in terms of credibility to your work and the style of work that you did, that people would be interested and curious about you and your work as an actor.
Madness need not be all breakdown. It may also be break-through. It is potential liberation and renewal as well as enslavement and existential death.
It always annoys me when stars grumble about fans coming up to them in the street. I love it. These young stars today with all their airs and graces, they need to remember it is an honour and a privilege to make money from acting. How hard is it?