A millimeter? Considering that there is quite a variance in the actual molded rubber or plastic design with different cordset and different cord cap manufacturers, I can't see an extra millimeter on the blades being more of a shock hazard than a slimmer designed plug....
Besides, aren't most people smart enough to kinda get the idea you aren't supposed to touch the shiny metal things as they disappear into the wall outlet?
(ok.... I might be stretching that
)