I don't understand this. I thought any diver can call any dive at any time for any reason.
You can call a dive by raising your thumb, and performing control ascend by following the procedure. I don't think that this is something that is happening during a panic episode, almost by definition.
You calll a dive while being rational and communicate with your team, not when your monkey insticts have kicked in.
Is GUE really this "one strike and you're out" type of community?
I don't think so for anyone that is willing to learn and improve, assuming an obvious minimum qualification is met.
I only said that some people will become more relactant to dive with you, not that nobody will dive with you.
Speaking for myself:
If I am diving with a GUE buddy in reasonable conditions (as expected) and at random they panic (forcing me to potentially violate procedures, stressing me out, etc to try my best to save them which necessitates skills that I don't have), I personally will avoid for a bit diving with them the same way, because in my mind they will be "compromised" for a while. I dive for fun and for relaxing, not for stressing more than during my dry life. I would be a massive liar if I said that I will continue considerring such diver a safe buddy, and that I will show them the same trust as before, meaning that I will be forced to "babysit" them and constantly checking with them during a dive, which would be no different than any vacation insta-buddy (the type of divers I tried to avoid by going to GUE). Of course this is a result of my limited experience and lack of skill for addressing such situation, thus I try to minimize getting involved in such situations. To my limited understanding, a panic attack is a result of deep unresolved discomfort, fear, etc, that requires some major introspection and mental work to resolve. I have never experienced it, I cannot understand it as an emotion or feeling, thus for me it's a black box that might be enabled at random intervals. I have done some very stupid dangerous dives, I have been in situations that for other might have been extremely stressful, and at worst I had only a coldblooded thought that there is a 20% probability I will not make it with no fear. In the same flavor, I have the (maybe uninformed) belief that a person that already got a panic attack is more likely to get one in the future, than somebody that never had one during their previous dives. I know how to practice with somebody some skills (S-drill, V-drill, DSM, basic 5, etc) to improve in case they mess up (or more often when I mess up), but not how to practice so they will not get a panic attack again. If I really love them I would take the risk to dive again safely etc, but this is (at best) a dive I will only enjoy by proxy.
General for GUE (to my limited exposure):
I would say it depends. Many experienced people might have no problem performing some easy dives with you (including myself if we dive at maximum 10 feet), but I think it depends a lot on the type of dives you are performing. For example, if a C2 diver gets a serious panic attack in one dive, I don't think that the next few dives with their buddies will be in a serious deep penetration, or even in overhead environment. I might be very wrong on that, but a unified dive team is as strong as the weakest member, and the potential of a panic attack (a major factor for deaths) looks like an important weakness. I could imagine the diver to have no issue to re-establish themselves in their community after they take the steps necessary to address their issues.
P/S: Apologies if I have enough run-on sentences in this post. I am seriously overworked and sleep deprived.