I find it extremely odd that people are so fixed on the idea that in this scientifically and technologically advanced day and age, no-one "knew" or "could predict" what to do.
Infection control is very well understood and managed on the daily in medical settings, which is why many illnesses / diseases don't run to pandemic levels regularly.
History has given us the lessons of the plague and Spanish flu. Governments run planning exercises and predictive planning simulations regularly.
While Covid was "new" (and likely manufactured / manipulated to a degree in a lab) many aspects of it mirrored other contagious respiratory illnesses. Yet it was treated as something completely novel and with an irrational level of suspicion and paranoia.
There are globally agreed pandemic strategies too.
The bottom line boiled down to money I think. In the first weeks of 2020 it was obvious that there was a problem, yet no-one wanted to interrupt the economy, with sensible measures such as border controls or minimising big gatherings. Ironically in bringing in lockdown, and applying disaster capitalism, the economic impact was even worse.
You can understand why people were driven to conspiracy theories, which again could be seen as representative of a world focused on never letting a good crisis go to waste in terms of profit (for a few) and where the unspoken rule is that how you make money is secondary to the opportunity to do so. The mixed messaging and authoritarian stance was absolutely designed to keep people in a "state of fear" and provided fertile experimental ground in behavioural psychology by the government. Even experts working for the government at the time have said they went a bit far.
As to the human cost - well, we're talking an unnecessary number of deaths obviously, from both Covid and things left undiagnosed / untreated because of Covid, psychological effects and a cynicism about our democratically elected leaders that will probably never go away. I mean, no-one really trusts politicians as a rule in general, but the pandemic really showed how unprincipled and self-serving they can be.
No amount of inquiries or dissection or "lessons will be learned" will undo or excuse the flagrant failures of our government when the shit really hit the fan, but didn't need to if they'd just taken their heads out of their green back lined arses at the earliest opportunity.
I was lucky. My Mum died from ovarian cancer in my home in April of 2020. She didn't have to die alone. District nurses were great for daily ascites draining and pain management, but as for the GP, prescription shenanigans and the vanishing of all other support, that was a shitshow indeed. And I know others experienced far worse. It's not something you can expect people to just get over. It changes you fundamentally and erodes any sense of security in the world.
As for accountability? Never mind prison, I say make the perpetrators live in austerity and paranoia for two years under threat of fines and incarceration in some sort of pandemic enclosure. Because they weren't in it with us, they were protected, and then complained when we didn't "pandemic right" when they'd stripped the country of sensible means to do so. For money reasons.
And don't get me started on wealth transfer.