Even if done “right” privatization is the wrong choice for a lot of things. Like everything that should be a service for all citizens: postal service, health care, water, electricity, …
When greed is introduced into these services people will suffer for it. Just look at all the examples of privatizations and show me where the outcome was positive for the people.
Oh, we could probably create giant trees with selective breeding and gene editing. But those trees would still need hundreds of years to grow (and that’s a good thing, since it would store CO2 while growing) and if there are problems with the gene editing we would only notice after decades.