We’ve lost the plot here. Lumumba assassination was in 1960... 60 years ago. Since then, China had a Cultural Revolution, murdered their own people in Tiananmen, taken over by force and oppression in Tibet, Xinjiang and Hong Kong.

If we are comparing the character and proposed world order of China vs. US (or whoever else), we should be focused on the present: that which is actually on the table to choose between.

Maybe read your sources before posting:

"The report concluded that Belgium had not ordered Lumumba's assassination"

And

"In 2013, the U.S. State Department admitted that President Eisenhower authorized the murder of Lumumba.

However, documents released in 2017 revealed that an American role in Lumumba's murder was only under consideration by the CIA.

CIA Chief Allan Dulles had allocated $100,000 to accomplish the act, but the plan was not carried out."

It does also say:

"In the early 21st century, writer Ludo De Witte found written orders from the Belgian government that had requested Lumumba's execution, and documents on various arrangements, such as death squads"

I realise that this may be a bit of confirmation bias on my side, regarding which of these I believe.