Cameron was a fool for putting this up to a vote in the first place. (read the reasons behind it why - little to do with trusting regular folks versus the elites, etc - it was all a bunch of leadership bravado, and promises..)

Secondly, he was an idiot for not requiring a "clear" majority (say 60%) of a minimum percentage of the electorate participating (say 75-80%)...

Whether you agree with the result or not, the first "sadness" is not the decision to leave, but the sadness of having a poorly designed process to determine how it was done...