And how that particular person felt on that particular day was in part a function of how well they slept, whether they read your application before or after lun

And how that particular person felt on that particular day was in part a function of how well they slept, whether they read your application before or after lunch (c.f. Hungry judge effect), and any uncountable other things. Random. Some people's world views aren't robust enough to handle the idea that some of what they got they didn't deserve. It's unfair in the best way. It's luck. It's grace. Every person with access to this website has been granted things well beyond what is "fair".