One example alone I can think of of how privatisation is bad is that redundancy is ignored because it is not profitable.
At worst, it leads to people suffering, at best, it needs constant regulation and enforcement by the government to stop them running in an unsafe manner.

There you go. The classical myth of "natural monopolies" and the intervention of the government, such as licenses, protectionism, "public utilities", subsidies, etc. are the mere cause of this problem.

"The fact that the government must give permission for the use of its streets has been cited to justify stringent government regulations of 'public utilities,' many of which (like water or electric companies) must make use of the streets. The regulations are then treated as a voluntary quid pro quo. But to do so overlooks the fact that governmental ownership of the streets is itself a permanent act of intenention. Regulation of public utilities or of any other industry discourages investment in these industries, thereby depriving consumers of the best satisfaction of their wants. For it distorts the resource allocations of the free market."

Companies will literally use child labour if you let them

"[...] the only reason our children don't have to do this type of labor is that we are wealthier, not because of our child-labor laws nor because we are somehow culturally or racially superior."

Any ban on child labor is utterly counterproductive and potentially life-threatening to the very people the government is "trying to protect". Only economic development can improve the lives of these children, and nothing short of unrestricted free trade will do.