Despite the quasi-facetious "TRUST NOBODY" above, I have no problem socializing and making friends online, but i dont extend great gobs of trust to everyone. Do you? Building trust takes time and interaction. Larger Orgs have less interaction between all members than smaller ones because of time zones, work/school schedules, etc. and it ony takes one Reaver infiltrator to totally ruin your Org/personal efforts. It would be great if we could always know right off the bat who's a Reaver and who's a Good Guy, but unfortunately sometimes you don't find out until you feel the vibroblade slip between your ribs.
As for NPC crew "jeopardizing" the social aspect of the game - How? Will such a mechanic suddenly turn everyone into antisocial loners? Will it force everybody to fly solo with only their droids to interact with? EVE only has single player ships yet their chat and community are still active and space is full of fleets working together (even though popularity has been declining for some time).