Let's only consider Chinese Communist Party members, which is still a deeply Leninist organization. My rough math is 90mil/1.3b ~ 7% chance that any Chinese from the mainland I encounter belong in an organization that has enacted laws that turned the entire population into informants, an army that will literally crush your scull with a tank if you participate in any protests, an organization that thinks shipping millions of Uyghurs to gulags is an education and jobs training program, an organization that thinks exterminating languages and cultures are okay in the 21st century, an organization that is at the helm of a totalitarian police state.

While 7% isn't even close to the majority, it's a little higher percentage of democidal, genocidal, dictatorial co-conspirators, or would be co-conspirators than I would have liked. Mind you, this is only considering CCP members.

You probably think I'm evoking McCarthyism, no, I'm simply evoking vigilance. In a mature and democratic society like the US, there is a spirit to give everyone a fair chance to succeed, this spirit is embedded into laws that ensure equal opportunities and strengthen civil rights, and I believe this is admirable values that are worth protecting. On the other hand, it is exactly for the protection of these rights and freedoms, mechanism needs to be put in place to prevent their destruction, and they do exist already in the forms of the Constitution, FARA and the various anti-sedition/treason/espionage acts in the US.

In a controlocratic police state like the PRC, where all the sticks and carrots steer people away from basic human decency and morality[1] their entire lives, there's no reason to believe a majority of them will suddenly become decent and moral once they leave the border, especially not if many of their expat friends still have ties with the CCP's foreign branches. They are either too scared to do the right thing or worse, still don't know what the right thing is. The good thing is, democratic institutions have all kinds of defense mechanism against behavior against the host's national interests and freedoms, I'm simply suggesting you use them. In the UK, the Tube broadcasts "see it, say it, sort it" every 10 minutes or so to alert passengers to report any suspicious activity, possibly as a defense against terrorism. I believe the US and elsewhere should also practice this when it comes to CCP infiltration operations.

As to containment and liberation (the political and foreign affairs circles use the term liberalization) strategy, this Wikipedia article[2] isn't a very good start but it's a start. If you google the term, you'll dig up at least 30 years of articles and papers from publications like Foreign Affairs and the DoD's archives. Also, see TPP and neo-liberalism.

The recent anti-Chinese drumbeat has been a long time coming. Anybody who's been paying attention on the ground in Hong Kong since the handover knows the mainlander are only there to encroach and erode "western" ideals and institutions to advance the CCP's interests of staying in power forever. Hong Kong has suffered quite a number of substantial blows in recent years, this extradition bill on the table is the last straw, I really hope other nations don't have to bow to such regime anywhere in their territories.

[1]: https://en.wikipedia.org/wiki/Death_of_Wang_Yue
[2]: https://en.wikipedia.org/wiki/China_containment_policy