I didn’t necessarily mean that there would be less corruption (though if you think about it, if insurers were not in the picture that would take out one source of corruption), just that sick people would probably feel less of the effects of it. Note probably, as that is always up in the air. But to further explain what I mean, if you are a sick person…say someone with T1D, you are always faced with huge bills, questionable insurance coverage, and a constant worry of what you will do if you lose your insurance for some reason. If you have universal heathcare, there are certainly times you will experience the corruption and cronyism, but you would most likely not face the same expenses and worry as one does under our current/past system(s). I mean there are definite issues with a government run system, but hearing from T1Ds in countries that have said systems, most seem to not experience the same stress as we do here.
Note that I am also not trying to vouch for either system, more so just vouching for systems that don’t rely on insurance companies as the primary payers.