Centaurus
Your statement "happens to the best of us " must surely be a contradiction. "The best of us" follow procedures and checklists as a vital part of their day to day working lives. Clearly landing with undercarriage in the retracted position indicates that the appropriate checklist/procedure was not completed.
Those that have allowed this to happen may once have been able to lay claim to the "best of us" however they obviously were mistaken, and can no longer.
******** statement sport.