Contrary to a popular beliefs, 6s don't necessarly seek security. They often confront with danger and avoid security.the security seeking 6w7.
Edit: how many types of 6s are there?! if they're the most common type, it's only because there are like 50 variations of them with little to no resemblance to each other at allI've sent you a link to permit you to estimate a bit the different variations of each type. I give it to you again: http://pastebin.com/gsAhzZqWEnneatype Six
People of enneatype Six are essentially insecure, as though life has never quite provided them with a proper footing, as though there existed nothing, either internally or externally, which could serve as a solid foundation. The type Six fixation is therefore deeply and fundamentally existential, and there exists at the core of enneatype Six a tight knot of anxiety, an essential disquietude, and a deep seated desire to find something or someone stable enough in which to place some trust. Given this essential dynamic, it is not surprising therefore to find that Sixes have core issues centering around the contrast between faith and skepticism, trust and distrust, and the legitimate exercise of authority versus the abuse and misuse of power. All Sixes share these core issues, but they respond to them in quite a wide variety of ways, making type Six the most complicated and variegated of all the enneatypes and the most difficult by far to describe with specificity.