For example, volcanic eruptions are regarded as tourism opportunities by Icelanders, but Europeans are in trouble.

China's industrialization and urbanization, on the one hand, promoted the increase of overall wealth, on the other hand, aggravated the distribution problem.

There are absolute standards for a thing in its specific context, but people are not interested in those unrepeatable events. What they consider is the situation that such things happen in other environments or themselves, so there are bound to be different results. This consideration is selfish, but understandable.

If the pursuit of absolute truth is involved, personal considerations must be ruled out. In this case, there can only be one result, and the difference between who sees who first and who sees later.