Not sure I agree here. Even if you define the responsibilities of the company (directors/board) very narrowly to just "maximise shareholder profits" you'd still have a question that says "measured on which timeframe?" so the tradeoffs and assessments are everywhere - even the supposed "easy answer" isn't easy (outside of an economics textbook...). If anything, the way these privatised companies are run in the UK and many other places in Europe seems to prove that the "shareholder profits" target is unfit for purpose and they
must have broader targets than just what can be measured in money. The whole point of "sustainability" in it's core form is that you have to be financially, ecologically and socially sustainable to have a long term future and that perspective seems to be exactly what is missing here.
Also, what's to stop a private company board from redefining it's purpose to be broader than just maximising profits at any cost? You can then decide if you want to be a shareholder in that company or take your investment elsewhere - in any case the "market" decides whether said company survives or not. Patagonia is one example of a company that has decided to do something else than just make money and as far as I know they are not out of buiness yet
Historically you can also see many family-owned companies who realised their dependence on their local community and built schools, public housing, sports facilities etc. because they realised that this was a good investment in the long run.
No, if anything it makes more sense now, because whichever way you look at it then narrowly defining profit as the only measure of success is even more dangerous for companies now. Even if you don't care about anything except money, society as a whole has started to care about other factors as well meaning that there are reputational and legal risks if you do not think broader. IMHO any company board that does not consider this aspect is borderline negligent and it seems that some shareholders (e.g. in Shell) have started to agree.