Why carry a subminiature? Well, to take photographs when you otherwise would never had had a camera with you and to get the shot that otherwise would be missed.
Hit type and cameras using 17.5mm film are not good cameras and the sample shown here (scanned at 5400dpi) from a 1951 film, possible taken with a Gem 16 II or a QP show why the other 5 exposed rolls where never processed. Jason Kudrna puchased the cameras and film in 1980 in Great Falls, Montana but has no knowledge of the children or where the camera came from before.
The tiny roll film usually have light leaking along the edge of the film as the spools do not make a light seal and many cameras themselves leak light.