It's quite the pickle. What Gaz did is just enough within scale of what we're familiar with that it rankled. The scale of Sadeas or Dalinar or Odium's wrongdoings are not as... personal, they're almost statistical. But we've all known and/or been (don't lie now) that level of pettiness and meanness, well not quite that level, just close enough to be uncomfortably familiar-ish with it.
Gaz was not a good person by any means, but was that completely on him? (yes, I can hear Dalinar's responsibility quote already) His situation did not really allow him to be a good man.He was trying to be degrading, dehumanizing towards the Bridgemen to systematically break their will and to crush his own capability of empathizing because that's how the game of the Highprinces was engineered: more dead Bridgemen meant more soldiers could make it across the chasms to get the gemhearts. The whole system was a machine specializing in breaking people. Gaz was driven by his own shame: the sooner Kaladin died, the sooner he could go back to looking away and actively participating in those heinous things. He didn't think he could be a good person. He thought he didn't have the option. He's a bitter old man. And when Kaladin started to give the Bridgemen hope, it put him in a moral & mortal crisis. So he fled.
Yeah, if what you're afraid of does come to pass it would rankle at me something fierce, but at the same time I can understand him. I don't like him, but I can understand being driven by shame.
Man, when I first read the Way of Kings, I was seeing red on behalf of Kaladin. It's quite a good analysis of societal complicity.
(or who knows, have you listened to the chapters 7/8 readings? Maybe Moash would stab Gaz in the face just as he starts to speak the First Ideal too)