You are very clearly uninformed about history. Especially if that's your list of brutalized countries with zero insight into the many factors stimulating US intervention in most of them and the aftermath resulting from failed or cessation of intervention, especially in those supported by the CCP.
Vietnam, Cambodia, and Southeast Asia Aftermath
https://en.wikipedia.org/wiki/Massacre_at_Hu%E1%BA%BF
https://en.wikipedia.org/wiki/Viet_Cong_and_People%27s_Army_...
https://hawaii.edu/powerkills/SOD.CHAP6.HTM
https://en.wikipedia.org/wiki/Indochina_refugee_crisis
https://en.wikipedia.org/wiki/Cambodian_genocide
https://alphahistory.com/vietnamwar/post-war-vietnam/#Purges...
El Salvador and Cuba I will grant that the clandestine support of a coup and refusal to condemn an oppressive, violent junta that came to power was inexcusable on the part of the US, but its involvement still has nothing compared to the CCP and USSR involvement in mass genocides and democides across the globe. The guerillas weren't benevolent liberators either.
https://www.latimes.com/archives/la-xpm-1993-03-18-mn-12349-...
https://en.wikipedia.org/wiki/Human_rights_in_Cuba
https://www.hrw.org/news/2016/11/26/cuba-fidel-castros-recor...
https://www.wsj.com/articles/SB121496498705421951
Nicaragua Another good example of the faults and failures of the US historically, but incomparable to the CCP, and aligned with global economics at the time. A victim of the intense geopolitical tensions and climate in the late 19th and early 20th century thanks in large part to the fallout from the Spanish-American War.
https://en.wikipedia.org/wiki/Banana_Wars
Afghanistan, Iran, Iraq. The collapse of the Ottomon Empire was the motivating factor in harsh and enduring political tensions in Central Asia. Not US intervention. US involvement in Afghanistan all started with solicited intervention by the populace for help against imperial actions by the USSR. Continued intervention was not purely political or economic in nature, and certainly not genocidal or democidal.
https://en.wikipedia.org/wiki/Soviet%E2%80%93Afghan_War
https://en.wikipedia.org/wiki/Afghan_Civil_War_(1992%E2%80%9...
https://en.wikipedia.org/wiki/Afghan_Civil_War_(1996%E2%80%9...
https://en.wikipedia.org/wiki/Taliban
https://en.wikipedia.org/wiki/Human_rights_in_Afghanistan
https://en.wikipedia.org/wiki/Soviet_war_crimes#Afghanistan_...
https://en.wikipedia.org/wiki/Islamic_Emirate_of_Afghanistan...
https://en.wikipedia.org/wiki/Persecution_of_Hazara_people#A...
https://en.wikipedia.org/wiki/Khalq
Iran Another failure, yet still incomparable to the history of the CCP. The rise of an Islamic theocracy in the geopolitical landscape of Iran should not be surprising, regardless of US intervention. It coincides with other theocratic revolutions in the region that were not the consequence of intervention by the US.
https://en.wikipedia.org/wiki/Muhammad_Zia-ul-Haq
https://en.wikipedia.org/wiki/Islamic_republic
Hopefully with this history lesson you develop an understanding that even with the many wrongs the US has committed over time, none come close to the CCP in its relatively short existence. The US has killed orders of magnitude less people domestically and internationally, justified and unjustified, across its entire history than the CCP has unjustifiably across the globe in the last 75 years.