Realistically, they can play how they want. Its up to you to decide if you want to have the experience that they provide. They are going to gang on you and thats that, if you don't want that to happen, don't go there, if you want it to happen, then go. Its really that simple.
This is from someone who frequents Liberty, usually solo, sometimes with buddies, which is very fun to do. Yes I have been in the same situation, up to maybe 7v1, Solaris boats and all, but thats okay. Its what I go there for, and its the experience I chose. Its realistic to expect that if you light up the security grid in a system your going to get whacked. And the 5th play their part well, they do their part. And in that I give very positive feedback to them.
The salt is very unnecessary in that regard, its all a game, play how you want, you are given the freedom to do so. Appreciate the people you play with as well, since this is an old game, with the population that has dwindled over the years. Its awesome that people still congregate to play together in such a nice way. Let's not disrespect one another. Voice of reason ftw.
Up, up the long, delirious burning blue
I've topped the wind-swept heights with easy grace
Where never lark, or ever eagle flew —
And, while with silent, lifting mind I've trod
The high untrespassed sanctity of space,
Put out my hand, and touched the face of God.