McDonald's isn't "ok", but it's limited in how evil it can be because it has to give some benefit to other people. A hostile AI could be even worse, because it doesn't have that constraint.
The financial system is what provides farmers with the necessary capital to be able to grow the food McDonalds needs to be in business. That doesn't necessarily make them okay either, but isn't allowing people to eat, without having to worry about producing their own food, at least of some benefit as well?
Doesn't 'financial institution' cover a pretty wide gamut? There are small institutions that exist in only a small town, to government owned entities, to giant businesses that span the entire world. Are they all categorically bad? What can be done to make them less bad?
Why not? A 2012 report estimated over 19 trillion dollars in lost household wealth, and contribution toward the largest number of people living in poverty ever recorded by the US Census bureau. http://www.pbs.org/wgbh/pages/frontline/business-economy-fin...
