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Right click the game and go into properties -> local files -> verify game files.
It will check for files that are broken/outdated or missing and replace them.
https://forum.kerbalspaceprogram.com/index.php?/topic/196055-no-keyboard-input-on-a-mac/
https://forum.kerbalspaceprogram.com/index.php?/topic/193527-kerbal-space-program-not-taking-keyboard-input/
Might be worth asking them if they solved it.
I would mainly be thinking about some other software / feature that might be intercepting the keys. Like, Geforce Experience is the common culprit on PC for snatch away the ALT+F12 command.
Edit: Oh, another thought, do Mac's have something like "sticky keys". On Windows this is triggered by tapping shift 5 times and can completely screw up your inputs.