Visiting to the sites of serious incidents by the political leaders in the Western world is a totally political show to paint the politicians as caring people for election purposes and promise funding. It is only a show for supports and is a tradition in the Western world. In China, there is a system which determines which level to go the site depends on the number of deaths in the accidents. The top leader in China should not visits every time there is an accident.
That is in fact the problem of the so-called modern societies or nations which focus on every single one person. We always hear from the government leaders that we will never leave single one behind when something bad happens. That means we have to protect everyone 100%. That creates huge price tags to cover everyone based on statistical theories. It is impossible to protect every single one. It is only a political slogan. That is why the modern societies become poorer than before.