I agree with Oakley. Constant bitching would get very tedious. Its nice to have quiet interludes when they all seem to get along (like tonight). This is also an opportunity for them to open up and get to know each other better, which in turn can lead to some realignments of house members.
As for whether they have the propensity for peace, I would suspect in a group this size the answer would be no. Once the numbers go down and they shake out those that don't "fit" with the core group, things will get much calmer. Thats why the later stages are usually duller....which brings us back to your original question!