Why are physicians minimizing the problem of preventable errors?

CNN recently had an article describing 10 common mistakes in healthcare http://www.cnn.com/2012/06/09/health/medical-mistakes/index.html?hpt=hp_bn12.  This article stimulated a huge response (>1200 comments).  For the most part physicians criticized the piece as naive. My take? I was very pleased the CNN was making effort to explore a very important issue that continues to evade significant public scrutiny. We simply don't have the proper sense of urgency.
   Are there 250,000 or 100,000 deaths per year due to preventable mistakes? Does the exact figure matter? Think about it. If 100,000 die each year each life touched at least 10 others. Based on my own personal experience those 10 close family members and friends will never forget the loss of their loved one. That makes 1 million people affected. The personal price for ignoring medical errors is far too high. All caregivers need to feel a sense of urgency and WE MUST CHANGE.