This is due to the living story event. If you haven’t caught up or paid attention, you would have realized that Southsun is in a total mess with all the wildlife becoming aggressive and attacking everywhere (hence why the huge density/vets). To top that off, the settlers and consortium are at each others throats (hence why the frequent events).
It will be dispersed and calmed down after the living story is over. It’s part of the living story to make it more realistic, if you don’t like it then don’t go there until it is over.