In China, engineering is the most prestigious major as opposed to lawyers or doctors in the US. In highschool, if you aren't very smart, you are told to go into liberal arts. If you did well in school, you almost always went into STEM, even if that is not where your passion lies. So it's not hard to see why there would be a disproportionate amount of Chinese leaders with engineering degrees.
On a side note for those who are interested. Here's a list of political figures who are from Tsinghua University (China's top engineering university):
https://en.wikipedia.org/wiki/Tsinghua_clique
On a side note for those who are interested. Here's a list of political figures who are from Tsinghua University (China's top engineering university): https://en.wikipedia.org/wiki/Tsinghua_clique