Was CheckingPremises.org established just to criticize Diana Hsieh?

No.  It did start as a discussion among a group of Objectivists who were concerned about many of Dr. Hsieh’s views; specifically that we considered them to show a poor understanding of Objectivism, not only in conclusion but also in philosophical method, and that they are potentially harmful to the spread of Objectivism and how Objectivism is perceived.  However, during our discussions on this topic, we shared many personal stories about our early days as students of Objectivism, how past controversies and schisms in Objectivism affected our learning process, and how we all wished that there had been a central resource for identifying the principals and principles involved, collected in a convenient repository. We all agreed that such a resource would have been of great value to us, as we struggled to grasp and judge the often difficult issues in such cases.   Thus, the idea for CheckingPremises was born.