Deletion of Teachable moment

Comment: I think there's an argument to be made that |undue weight is given to the phrase's use in the Gates arrest controversy, but this appears to me a fairly well-sourced, semi-interesting article. The source to Robert J. Havighurst's book is fairly convincing that the phrase has something like notability outside of the Gates controversy -- and, indeed, that it could/should be treated less as a phrase and more as a concept
Stance: keep
Cited policy: Wikipedia:Neutral point of view (WP:UNDUE)