Was he really that bad? It seems like his trial was a sham and he never really deserved it. did he do anything illegal? He accepted the new constitution and used his (legal) veto power and got executed? Seems unnecessary tbqh.
Why did China started to stagnate so badly after being the world's leading civilization for millenia? During the Song dynasty they were on the verge of industrialisation - centuries ahead of Europe at the time! - but then it all just kind of fell apart. Why?
A second question related to this: Why did it take them so long to reassert their old place of major importance after getting their wake-up call during the 19th century? Japan managed to catch up to the European powers just fine, to the point they were called in for the international coalition meddling in Chinese affairs. China should have initially been in a far better position than Japan to close the gap, yet they were utterly humiliated.
It's kind of crazy if you think about it. An impartial observer during the first millenium AD would have reasonably expected for China to be the country that could most likely dominate the Earth. But then their trajectory just changed for the worse until very recently.