In order to be elected president, candidates find themselves anticipating changes that they not so rarely fail to realize. This way they prepare themselves a great task that in case of failure they would later have to deal with.
Observing and making statements on a promise that failed to become reality, we are directly pointing fingers at the president himself.
Same goes for success. It is no longer a country's success but the success of one man only.
<em>The president is the incarnation and metonymy of the entire nation.</em>
Children will associate there unacceptable behaviour with getting spanked, and the purpose is to dissuade them from partaking in that behaviour in the future.