A corporate research station.
That is out of the Icarus' range.
With various non-antag threats (Carp, tunnel dwellers, etc.)
Frequent visits from traders, some of which are Vox who are known to be possibly violent or dangerous.
On top of that, while the ISD is reliable at best, it's completely dysfunctional at worst.
It's within the Icarus' range considering that the station gets malfunctioning drones from them occasionally.
The security department is there to deal with carp/tunnel-dwellers, why would civvies be directly interacting with them?
Traders are also vetted by CC before they're allowed to come, p sure.
I don't think the sec department being totally incompetent to the point where bringing guns is required is canon either.