How could one find a flaw in Williams' play A Streetcar Named Desire?

It should be stated on the outset that it is going to be
difficult in finding a flaw in Williams' work.  He is a powerfully compelling writer in
displaying human conflict and interactions that help to bring out the sense of sadness
within individuals.  I think that this needs to be stated on the
outset.

If there is a flaw in the work, it might lie in the
lack of social redemption.  It seems that if Williams really wants human interactions to
improve and not be rooted in subjugation, there should be some level of hope offered at
the end of the play.  Stanley might be exposed as a brute, but he ends up being
victorious.  Blanche, the only threat to checking his cruelty, is institutionalized.  I
think that this is something that ends up becoming the ending that negates any hope of
social or emotional transformation.  Stella's pragmatism precludes much in way of
redemption and in this, I think that one could point out a flaw in Williams' hope and
what he has depicted.  Certainly, those who emulate Stanley and his sense of cruelty
could feel emboldened by the ending, which would be the direct opposite of what Williams
wants.  I think that in the lack of a socially redemptive or transformative conclusion,
there might be some level of flaw present.