It's a bit rich to say that the KMT "caused" hyperinflation. The war caused hyperinflation. Maintaining an army that cost 4 times more than the available tax base caused hyperinflation. That they weren't able to arrest the hyperinflation in 1946 is related to them still needing the army in 1946-1949. It's like blaming the Russians besieged in Leningrad for "causing starvation," the starvation was a property of adverse circumstances forced on them from outside. Similarly, the KMT was forced into it.
They weren't all that smart in their attempts to stop the inflation and some policies, like allowing the army to buy grain at set prices made it worse, but inflation was a consequence of the war.
The CCP of today is certainly less corrupt than the KMT was then. But that's neither here nor there. The KMT corruption was the corruption of the powerful in a time of scarcity. Lots of corrupt right wing states have gotten their houses in order if given time to do so. South Korea, Taiwan, Spain, Portugal etc. Corruption alone wouldn't do it.
Modern CCP corruption is on a larger scale but it's not as desperate. It's not the powerful taking food because they and others are starving, it's just taking shit for the sake someone well off getting more.
Two things, 1) Truman was prejudiced by the bad views that Stilwell and then Marshall had for the Chinese. Kong Xiangxi and the Soongs were certainly war profiteers... but we sent aid to Stalin, so I can't really see any moral universe where mere corruption is justifiably seen as more heinous than the things we can't talk about on this forum.
2) So much aid. You really should watch the lecture I linked two, but here is the relevant slide from it.
China got very little aid compared to the other allies, and, of the aid shown in that slide, only about 5% went to the Chinese directly. The rest went towards the maintenance of US forces in China.
Also, why can't you find a better source on KMT corruption? You find an article about modern corruption that has a 2 sentence blurb about corruption back in the Republican period.
Here is an actual book which has lots about how the structure of the KMT exacerbated corruption and how the war led to many decisions which made things worse. This is the book you want for the thesis that the corruption was insurmountable.
http://books.google.com/books?id=OTasAAAAIAAJ&q=corruption#v=snippet&q=corruption&f=false
Now, that book was published in 1986, so here's a review of Rana Mitter's book which also has a nice overview on how the historiography of the Chinese war has changed.
http://www.history.ac.uk/reviews/review/1548
Now my thesis for HOI4, gameplay wise, is that a China that can do more things right from 1936 can be a major power by the end of the game.