Again, your summary is a simplistic half truth. There are lots of prominent examples of intra-party checks. Trump recently was opposed in political processes b

Again, your summary is a simplistic half truth. There are lots of prominent examples of intra-party checks. Trump recently was opposed in political processes by his own Vice President and Supreme Court nominees, as well as some members of Congress. Within the Democratic party, there are also examples of these checks happening within the party. DeBlasio (mayor of NY) and Cuomo (governor of the state of NY) have been fighting against each other for years. More generally though, not everything in the US is a political decision. There are other practical checks on the political process itself, like the freedom of speech Many Americans either don't like either party, or at least don't like the leadership if either party right now. We don't have songs like "Without the Communist Party, There Would Be No New China" (https://en.m.wikipedia.org/wiki/Without_the_Communist_Party,_There_Would_Be_No_New_China https://en.m.wikipedia.org/wiki/Without_the_Communist_Party,...). While unlikely, in the US parties can go, and have gone, extinct through the normal political process. And every four years (depending on who wins the Presidential election) there are opinion pieces considering one party or the other's demise. If people disappear for comparing the CCP's leader to Winnie the Pooh, I can't imagine it's very safe to write about the CCP's demise within China.