Not much is known about Sigourney Weaver’s Alexandra in The Defenders except that she seems to be a businesswoman in a high ranking position within the Hand.
Being a high-powered person in the corporate world, she doesn’t get too bogged down by right or wrong and simply stares ahead and does what needs to be done.
What her ultimate goal is is still unknown, but whatever it is, she doesn’t consider it to be a bad thing.
She doesn’t consider herself to be the villain and she certainly doesn’t think of Daredevil, Luke Cage, Jessica Jones, or Iron Fist as heroes.