The way I see it is pretty simple. All the unlawful factions in Disco are pretty territorial. They don't want anyone to poach on their ground. So I have also dropped doing whatever I've been doing if I have noticed a Corsair on scanners.
And while Mentira is now a terrorist IDed ship, he's pretty known habitant of the Las Omegas with a known Modus Operandi (cargo piracy), so he surely goes to top priority to deal with. So in that light I can't see what Eric/Vilkas did wrong there when he encountered you.
I wasn't there, so all I know about the how things proceeded. I surely do not know the history between you guys (there seems to be a lot of it) or how to solve it.
For the indie Hessian. Who knows what they do and why:P. We try to scoop them up and let them participate and teach them, but we kinda all know how it goes. Some listen, some don't.
About cargo piracy we've been talking about it among HC and RHA does have a PT for the purpose. The cargo piracy is still in the early stages, but in the future we hope it grows into something substantial.