Your causation is totally backwards here

Judges 12:6 Then said they unto him, Say now Shibboleth: and he said Sibboleth: for he could not frame to pronounce it right. Then they took him, and slew him at the passages of Jordan: and there fell at that time of the Ephraimites forty and two thousand.

The corrupted pronunciation of the Ephraimites is said to be not right, not just a more modern way. I think this shows God's attitude to this.

I don't even... I just... egads.