I like to toss the word "fear" around sometimes too. Pretty sure the mods have waved their "be good" stick at me for it at some point or another.
No PvP player fears a PvE only mode. The problem, and this is a huge assumption on my part, is that a good chunk of the pvp tryhard types are nothing more than screaming teenagers who've grown tired of Call of Duty and have moved on to shooting space men for their kicks, especially since traders and non-pvp bounty hunters tend to cry some of the biggest, saltiest tears.
That being said, they suck at arguing against a PvE only mode.
I'm against it being implemented solely because it already exists in the private groups function. I think they need to expand on that function before making it irrelevant by adding something entirely new that serves basically the exact same purpose.
We need to stop asking for knee-jerk quick-clot reactions and push FDev to expand on the tools that were already given to us so that we may be able to actually use them to their fullest, rather than look at them as the bandaid that they are right now.
If groups were fully implemented with the group owner able to select a ruleset that is then enforced by game mechanics and the group administration was streamlined and there was an option to make a group public where it is showing in the group list when you select to play in a group I would totally agree with you that there would be no need for requesting a PVE multiplayer option on the login screen...
Until they have gotten that in place... there will always be people aksing for that option...