Exactly this.
Let me use an example I like to try and explain the difference between the two.
Lets say you are at your friends back-yard BBQ, probably no bouncers or cops around, no security of any sort really except what you and your friends can provide. but despite that you are PROBABLY about as safe there as you can be while out in public. sure someone might get drunk and throw a punch but thats about the worst of it. No security, but High safety despite that.
Next lets take the neighborhood bar, maybe there is a bouncer there, maybe the owner has the cops on speed dial “just in case” pretty low security over-all, but still its security of some sort. its also still “mostly” safe, sure the odd-bar fight might break out but probably nothing much worse than that. so low security, but moderate safety.
Lastly lets take the busiest night-club in the city, lets even say they are having some big special event. They probably have teams of bouncers, everyone going into the club is getting pat-down at the door, hell they may even have some actual cops on duty just to make sure everything goes smoothly. about as high security as you can possibly get at a social function, but also the greatest likelyhood that SOMETHING is gonna happen, probably at least a couple fights during the night, some phones are gonna get stolen, the bathroom is gonna have more drugs go through it than a pharmacy. So high security, but also the lowest safety out of these examples.
Point being, the highest security does not directly translate to the highest levels of safety. (Incidentally, thats also why null-sec is generally one of the safest places in eve, because even though its got the lowest “security” its the back-yard bbq style example, except you and all of your friends are packing world-shattering doomsday weapons)