It doesn't "make sense" for a lawnmower to cut hands either, it isn't a meat grinder after all. However it is a blade attached to a motor and from a purely mech

It doesn't "make sense" for a lawnmower to cut hands either, it isn't a meat grinder after all. However it is a blade attached to a motor and from a purely mechanical, non-human perspective it will cut whatever comes within reach.