Its OK to move fast if the cost of failure is very small. I do not understand why the Crowdstrike change was not tested appropriately, why this problem not fou

Its OK to move fast if the cost of failure is very small. I do not understand why the Crowdstrike change was not tested appropriately, why this problem not found in testing. My company has a automated test suite that takes some time ( several hours ) to run along with manual tests before any software is released. If its a risky change needs to be reviewed another developer. If it is a emergency production change the testing is much less , however change is still reviews by an experienced developer and still manually tested by a tester. The regression tests are not run...