It's negligent if the team didn't find ways to move the bitcoin years after Satoshi's absence.
Negligent?
You're looking at it from 2021 eyes, not from 2009 eyes where bitcoin was practically valueless.
Until those addresses become available or identities proven, if ever, ascribing morality to why those are locked away is
impossible and not respective of what the individual(s) may have believed.
No one knows the reality and it's still a myth that the person called "Satoshi Nakamoto" is real, Japanese, etc. until now, all those stories are spreading on the internet but the reality is still hidden.