Servers can disable PVP, it's already possible, but there is no indicator for that in the serverbrowser yet (will be added shortly). Then the focus on this server is completely on PVE and/or building
Alternatively we will offer serveradmins the ability to restrict certain items, so guns could be banned from a server if desired.
But I guess guns won't be a big problem, especially when there are no automatic rifles or sniper rifles. Otherwise a bow or a crossbow could also be a problem then.