I don't think a significant amount of Americans, Europeans, Russians, Chinese, etc genuinely wish the decline of any of the other countries. It's just their leaders that create these situations and force us to pick a side.
Most Americans can't even see past basic propaganda nowadays. There's a severe lack of critical thinking. Everyone points the finger and then can't even inconvenience themselves in the slightest.
Reminder, something like 50% of Americans under the age of 40 get their news primarily from TikTok and other social media. This has destroyed critical thinking and basic understanding of the world. On top of that, young people do not value democracy. Something like 40% of young Americans are willing to sacrifice democracy for various things. There's a whole Radiolab episode about the "erosion of democracy".
Think SEA, Korea, Japan are going to feel better off with China empowered by a weak USA? They want trade for both national security and their economic interest. I'm sure Samsung and Sony want to pickup their share of the Chinese electronics exports.
Has Germany proven they won't sell out to do the right thing? I can't imagine German car manufacturers don't want in US markets for some greater cause. BYD is eating their lunch in China, but BYD is also non-existent in the US market.
We are possibly looking at the US kneecapping the world economy (including its own) but I'm highly skeptical country A isn't going to try to capitalize on country Bs expensive exports.
Meta allowed a terrorist to livestream a killing spree in the town I grew up. They didn't act when people began mass reporting the stream and were reluctant to take action when people reuploaded it or posted content glorifying the gunman. This literally went on for months, and months - that much of the surrounding content had been classified locally as objectionable didn't seem to matter. Time countries held Meta et el legally liable for the content posted to their platforms.