Without consequences to choices, what do they really mean?
Practically nothing. And this suits me fine. While it is possible to have an outlook of 'what your doing is cruel because of X, but I'd still consider you to be a [insert positive trait here]. While this won't change the fact that we are [insert negative situation, like war] I'd just like you to know I don't absolutely hate you, as a person.'
I've seen the above quite alot. I'm fine with it and think it's quite natural; most balanced individuals can separate one's person from one's actions; for instance, my former char, while a Federal, still maintained respect for a few State citizens and a couple Imperials, while disliking a few 'pro-Minmatar' for their actions and the way their char's behaved socially.
Actions should have reactions, and while having people set red or being political or ideological enemies could well and should well be a barrier of sorts, this don't have to imply that you HAVE to stop being civil or even leave your RP group due to conflicting ideologies between OOC friends. That's just... not needed. This is why people have OOC channels - to socialize as players regardless of IC stand-points. I've seen people take the OOC to levels where the IC is aborted (leaving corp for OOC reasons like 'I can't fight a friend of mine' instead of 'it's what my char would do' and other such things) or adjusted. I know one faction that alters their actions to allways remain blue to one other faction, even if that other faction is in opposition of thier IC desires and ideals, or so it seems. That makes no sense to me.
Fighting friends could be fun too - when my RL friend Ayalen took a stab at piracy some time back I hunted his ass down and poped him. Now that was quite fun, tbh.
When I left DUTY. to join MXD in FW I had to deal with being a direct enemy of Stitcher, even if I'd enjoyed flying with him and the others back in Duty. I dealt with that and went on with my desired actions from an IC stand-point.
IC actions should and do cause IC reactions. The OOC don't have to be altered in the slightest. Why go 'booh, your in X now, we are enemies and got to fight one another -.-' when you can go 'Seems we are foes now, this should be fun! See ya in space' Then just take it as it goes and chat about it later.