When you just leave it open like that non citizens don't always catch that message :"You can't enter or we'll fucking kill you, take your several thousands of caps and even if you run out we'll kill you anyways because we're ass holes..."I lost 1800 shotgun shells and 4k caps.Fuck me.Basically once a "citizen" opens and goes through it'll close back up and be locked so non citizens cant get in at all just like in Fo2.
If you want to make enemies, try to change something.
wearing a weapon for selfdefence at a place where every thief try to steal your materials for crafting?