Yes, anarki loads news.arc by default. You probably don't want to do that in your repo. Delete the line from libs.arc. Feel free to do that in anarki as well if it'll make your life easier.
Yes the original distribution doesn't load it by default. But I found that many people come to arc wanting to see how HN runs and it seemed worth reducing one step for them.
On a more pragmatic level, I found I was repeatedly making changes and forgetting to test them with news.arc. Loading it by default was at least a superficial sanity check. But this isn't a big deal. Like I said, feel free to delete the load, commit and git push.