Part of the rational behind kits is their history. in WW2 allied fliers had button compasses that were literally buttons, silk escape maps, tiny knives etc. While none of us are dodging searchlights and enemy patrols, the idea has come down via military instruction. A pocket tin may be OUR last resort, but to the casual hiker or ill prepared it becomes the FIRST resort. Getting somebody to carry a small kit is easier than a full kit because it is unobrusive physically and emotionally to their complacency.