the.com/bystander
Someone close enough to help, conveniently certain someone else will.
means A person present at an event who watches rather than participates, often during an emergency or crime.
from From the Old Norse-rooted verb 'stand' plus 'by' — literally one who stands beside, recorded since the 1610s as a passive witness.
Bystander effectMore witnesses, less likely anyone acts.
1964 caseKitty Genovese murder sparked the famous research.
Diffused blameResponsibility splits until everyone feels off the hook.