for me its not about bogeymen or shrinking in horror.... and indeed i do play in open for some things..... its just i find (some) players 4th wall breaking and not enjoyable. i play for enjoyment not a job, and not to put too fine a point on it, it isnt my job to provide fun for other players, that is the games job and if it is not doing that for people then that is the fault of the game not the players..
i am sure many are great and indeed i have found some who are just that..... but my experiences in open have often been pretty rubbish. just recently in a system being over run by an alien menace trying to presumably wipe out mankind i was attacked by meta pvp ships ... i had no chance of engaging them as i was geared up for defending a human base under attack (and indeed the thargoids would happily have killed these players given half a chance. so it isnt like the game supports a pro xeno stance)
one specifically who managed to "catch" me i had zero chance in the interdiction minigame (i kept the blob centre screen in the blue and still lost) and on the other hand the player could not kill me - maybe had (s)he been in a wing they could have - so i just flew circles around them for a min or so without even deploying weapoins (more to learn how strong my ship was against them before flying away. they were trying to start the interdiction dance again but i was able to dodge them and get to the combat zone with other players at which point it seemed they did not seem keen to pvp when outnumbered.... i cant think why
at no point was i afraid.............. it just wasnt enjoyable, it wasnt something that would do anything productive game wise and it totally destroyed the 4th wall..... so generally i prefer a PG which has for me the benefits of open but not the downsides
(but that said in general all my thargoid stuff is done in open just for player numbers)