Ahh, i got your point, but there just some another situation, its not like "we ally to fight more dangerous enemy". No, there nothing close. Its more about "Hey, guy, you are from another city, and you want make your own side, so we will kick you off from our sandbox". So in case when core appears, logically shot it first, because this is dont want ally with any side and unpredictable factor. This is like trying make new gang on already contested territory, without agreements with sides. They have their common story, even if it bloody most of times, while you completely alien for them.
But you damn right about unacceptible of friendly picnics without another distractions or weighty RP reasons. This is looking weird, this is honestly why i stop fly in Delta
Also i dont see what wrong with group-shooting common enemies first. Any 3 sides conflict always tempd went to 2 sides.
UPD(for slight clarify): Yeah, there pure commies just have more freedom in this sort RP. Marxism as thing in general about dividing societies, so helping to any separatists/rogue factions is our actual RP. Also commies ideology focus hate not on faction in whole, but on power-having part of it. Ally with [TBH] for us clearly unacceptable. Also Core with straight right-ideology and individualism focusing clearly exclude things above cease-fire. Same with small tolerance to any mercs or slavers, or groups prefering genocide solutions. Our hate vector very ideological, not national. And we can repress anybody who want cross their own hate with ideology and party's will.
Mostly funny, ApS exile was absolutely unexpectable for us, and their in-sairs plans really could've lead to much more hard situation for us, putting us in a corner.