Yes, so say I ... that is simply my opinion. Other references have since disputed and raised questions about the research and the "footnotes" and "photographs" in DAY OF DECEIT. So, it just depends on who you care to believe.
It should be noted that "ARMING AMERICA: The Origins of a National Gun Culture" by Michael A. Bellesiles was also heavily footnoted and allegedly painstakingly researched, yet most of it was shown to be, at best, largely "creative writing".