To me, it's pretty refreshing. Leadership and responsibility should certainly come from the top and any public statement about this should make it clear that the leaders take responsiblity. Direct and clear communication about all components that you think contributed to the failure is just as critical. Saying "we failed as an organization" is not helpful, and saying "I failed as a leader" is nice but not informative. Failures can have root and contributing causes; organizations may have many shortcomings; calling them out in order of importance (as best you can determine it) and emphasizing what must be fixed is the only way to remove a poisonous kind of uncertainty that lingers in a situation like this.