Looking at the world, we can see that even if not perfect, there are many cases of things which are done "outside of the market" but does works, from CERN to Appolo project, EDF/SNCF as I said in my original comment, European-style universal healthcare, ... it feels to me that being libertarian in this context is more like akin to refusing vaccines and keeping Azathoth alone.

When you mentioned economic "engineering," the first thing that occurred to me were various schools of macroeconomics and their proposed measures for economic planning via monetary, fiscal, trade, and other policies. Speaking as someone who has spent considerable effort trying to make sense of this supposed "science," I really don't see anything there but pseudoscience driven by ideology, hubris, political expediency, and rent-seeking.

What you mention here, however, is in the domain of those much older kinds of interventions that I spoke of: public infrastructure spending, wealth redistribution, and patronage of arts and sciences. Unlike the modern macroeconomic "science," you could have an interesting discussion about those even with an ancient Roman statesman. I am definitely not opposed to them in principle, and I think they should be judged on a case-by-case basis.

However, I believe you are far too optimistic in evaluating the outcomes of the contemporary such policies. For example, if properly done, government patronage of science can work wonders, but if not, it can give rise to a diabolical system of perverse incentives that will thoroughly corrupt the entire field of science in question -- and in a way that will still make it look fully legitimate to the general public, and make the critics who understand the terrible truth seem like laughable crackpots. Similar things can be argued about other government enterprises too, with corruption and disastrous bungling often rampant under a veneer of perfect respectability and (often sincerely deluded) pretense of success. And while we clearly won't agree about the extent this is happening, given the confident off-hand style of your examples, I definitely think you're badly underestimating this extent.