I suspect some people are guessing that a multipolar world will be less interventionist (since the great powers might block each other from interfering too much) and therefore adventures like the Iraq war are less likely to happen again. This might arguably make the world more peaceful, though it might allow civil wars to continue for longer.

No idea if it's true or will work out that way, but it's one hypothesis I think is out there.

Sure, the downside of China's rise is that authoritarian states have more legitimacy, but it's not like the western powers did much about those states back when they were the hegemons, so I'm not sure if the argument carries much weight either.

But that's not what happened during the cold war. The US and Soviet Union both fought over allies, influenced affairs in other countries, engaged in proxy wars, etc

You say "block intervention"... how does that work? That sounds like a proxy war to me... like the korean war, or vietnam, or afghanistan in the 80s. It's not peace, it's just bloodier.

The world is more peaceful today without the Soviet Unions fight for influence.

China is less imperialistic and appears to mess less with other country affairs. China never gave support for a dictatorship in my country. USA also jailed and persecuted the Black Panthers and had the macarthism. Their 2 political parties which are able to win elections sometimes appears to be very similar, at least about their foreign policy which impacts the world.

Lol. Tell that to Nepal and Taiwan.

> China is less imperialistic and appears to mess less with other country affairs

China threatens Taiwan INVASION to 'unify state' with FORCE if US Navy arrive

https://www.express.co.uk/news/world/890698/World-War-3-Chin...

Chinese Police Are Demanding Personal Information From Uighurs in France

http://foreignpolicy.com/2018/03/02/chinese-police-are-secre...

China demands immediate halt to THAAD missile system now ‘operational’ in South Korea

http://www.scmp.com/news/asia/east-asia/article/2092259/nort...