I don't agree with the drive by anonymous poster to your blog, but I do agree with the downvotes you got below
http://news.ycombinator.com/item?id=1821175. (And no, I was not the downvoter.)
The open question was how big of a stick the government should wield, and your response was to implicitly ask whether the other person believed in capitalism, and if not then should we go with communism? This is a straw man comparison. There is a world of difference between saying that the government should punish bad behavior harshly, and saying that the government should have any active role in the day to day management of businesses.
In particular Stiglitz' proposal is that executives who can be shown to have engaged in fraud and theft, be punished for it. He further seems quite unhappy about corporate governance issues that in practice make it very hard for shareholders - the theoretical owners of a company - to have any direct ability to control compensation of CEOs, or to get an accurate picture of what their own company is doing.
The appropriate discussion to have about this is whether Stiglitz' characterization of the behavior is correct. And, if it is, then whether his proscription would be reasonable, and whether or not it would solve more problems than it causes. It is not to accuse someone of not believing that capitalism works.