What is there to "not believe?" You don't "believe" my opinion? That's kind of funny seeing as how I'm simply adding 1+1 and coming up with a sum of 2, a line of deductive reasoning that would surely appeal to your aeronautical engineering trained brain. Players who exclusively inhabit group or solo at present are already flooding the forums with their complaints of griefers & assorted bad people; why would a new mode change that? These people already have the ability to avoid the people they find despicable/moronic/deplorable/unenlightened, yet here we are.
I don't believe your observation is correct. That is all. Although I agree that there are complaints on the forum, I do not believe that these complaints are initiated by players who are not in Open at the time (or on a rare occasion in a group that has rules that are being deliberately perverted for the sake of deliberate griefing).
I simply don't put any credibility in your assertion that it would be "inhabitants of a new mode" that would be "bitterly complaining".
That just doesn't make any sense whatsoever.
So I don't tend to believe that you think it would be true because there is no sense in it, rather I would tend to believe that you wrote is to support some other agenda (perhaps: FDev shouldn't make a PvE mode because there will still be the same amount of complaints so it isn't worthwhile making a PvE mode just to stem the flow of complaints).
In sum, I don't believe that you believe that complaints would be made by events that took place in a properly embodied PvE mode, because that would appear to make no sense or have any existing objective evidence to support your opinion.
To my knowledge, all complaints are precipitated by what happens in Open, or on the odd occasion, by griefers entering a PvE group for the sole intention of griefing. And all complaints made by players who experience these things first hand. It appears to me that more often than not they do not fully understand that avoiding the players responsible is fully possible. At least not without other expected disadvantages. Many players still do not know of Mobius. Mainly new players, which are a particular target for seal clubbing, so I understand their lack of knowledge. It is logical and excusable for any individual with any semblance of empathy - which is back on topic. (Also - the block function is useless until you know who to block...)
I would agree that then you do get other players joining these threads. From a number of viewpoints in all sides of the discussion. But I don't agree that players who would play in a well designed PvE mode would then initiate complaints about things happening in other modes. That would appear to me to be a found less claim.
Yours Aye
Mark H