If that's all of your points of view so be it. The way I see Gerald talking is in a way like he is reading it off non nonchalantly listing off the counter arguments and saying his point of view. He doesn't like darkspawn due to their taint. He doesn't like underground tunnels because of the chance of collapse, and he doesn't trust the wardens because they failed before. They didn't save Kirkwall from the Qunari due to their neutrality, they didn't save King Cailin, and as far as he is concerned despite being a traitor Loghain is a highly talented military officer and if he didn't trust the wardens when they had an army at their backs why should he? He isn't angry. He isn't shouting. He's complaining and he's annoyed since by his point of view there's no reason to risk the chance rather than just walk more. His voice is raised to only make sure people hear him nothing more so. 

The others have their victories to rally behind and they think themselves strong as you said. Gerald is a man who looks at how dangerous things are compared to the risks. He doesn't think a quicker walk down some dark tunnels is worth the chance of dying due to a variety of things and when it comes down to things like dragons as everyone seems to bring up what's the chance of running into them down the highway and even if we run into one that just means we wait for it to leave or we walk around it. That's not an option in the deep roads there's carved out paths if we run into a group of ogres or Hurlok Vanguards we need to put them down or risk going down another tunnel off the beaten path and hope it leads us to where we're going.