Communism is built on child like innocence. The very idea that it is possible to amass vast power without criminals worming their way in makes as much sense as leaving a thousand carcasses to putrify and not expecting buzzards to circle. Communism is always corrupt because it depends upon people addicted to power to do the right thing when they are given absolute power. Government authority is the well spring of corruption.
It should also be mentioned if only in passing that each of the misconceptions listed are all ridiculous red herrings. I have never heard anyone make quite these carefully worded assertions.