In a ideal world yes developers should care about these issues but developers need access to AWS keys to locally test integration with AWS services like SQS and Dynamo so access to micro service keys needs to be provided.

The problem occurs when they forget and commit, that key needs to be rotated which has caused downtimes in the past, or scrubbed which involves a messy fight with VCS support teams.

The problem is not just AWS, in general for third party integrations with platform like banks developers needs to test locally but they forget removing those keys. Each keys committed is a potential SOC2 / PCI non-compliance avenue.