The job of government is to take care of the people by providing trustworthy services that protect us. If they don’t function properly, it is a job of the people to make sure that they do. I do not accept the idea that this is impossible. I’m sorry that you cannot. But I will not accept the argument that this is impossible.
Your argument only convinces me that we must work harder to create government services that are better and more trustworthy. I will never ever accept that private industry is superior, because their interest will only ever be to serve the shareholder, and shareholders can never be trusted to serve anything other than profit. Therefore, your argument will always be flawed. Especially concerning the interest of the individual, as the shareholder and the profit holder will always want to violate that, and will never be responsible or accountable to the people or the public.
To that end, your argument is against corruption. To that out, the only real force to do that is the public, and a publicly accountable, democratic framework can be the only feasible means to that, never a privately-shrouded, corporate shareholder model.