Safety is actually enhanced by not putting a firearm in a slip.
I canāt visually verify for myself that the gun is in a safe condition if it is concealed, I have to trust that the person carrying it made it safe. I have twice seen loaded guns pulled from slips, once on a clay ground once on a shoot.
As to causing alarm, perhaps the individual concerned hails from a part of the planet where the sight of a rifle in the hands of a person who is clearly returning from a hunting trip doesnāt trigger a dose of the screaming fan tods.
Indeed, there may be lots of common sense about, but it is often poorly distributed.
Stay safe.