The dogs you describe sure don't sound regular to me. I wouldn't want them on my farm or in my house.
They are like a bunch of teenage boys on a weekend spree, one has to try and outdo the other.
Even the teenagers sound terrible were you live, marauding and all. I wouldn't them on my farm or in my house either.
I am sure there are exceptions, but, as a rule when two or more dogs travel in territory unknown to them they are not to be trusted and once they kill for sport they should never be trusted.
What a scary rule! If what you say is true, I don't think I'd be brave enough to leave the house if I lived in your area!