Humans are put to this earth for many reasons, there is the very basic purpose, some are more personal.
The basic reason we are here is simple, like all creatures on earth, we are here to breed and continue the legacy of the species called humans.
there are purposes which are more personal.
Some purposes are big, like Edison, inventing the light bulb to bring light to the world and the future and some are as small as just being there for a kid.
However small or insignificant a person's purpose is, it will always contribute to the big painting of life, making it more beautiful.

Maybe these people society labels them as "Failures" have a purpose, and their purpose is to be one the dark side. The world is grey, it is a blend of black and it has white, if there weren't any criminals, there would be any cops. We need to balance things out.
They are there, because they are there.

You do have your points. Everyone has a purpose in life, some found it and follow it, some don't. Maybe criminals are the ones that Haven't found their purpose in life and wandering aimlessly, somehow bump into the illegal part of life. It is abit harsh to call them "production over run".

Every life has a purpose, as cruel or unpleasant as it is, it happened for a reason.
Hitler waged a war with the world, causing the world war2, yes, it is very cruel and many had sacrificed, but it led to what we have today. I'm sure life would be different from today if WW2 never happened.
If WW2 never happened, japan never invaded Malaysia, Malaysia never had an independence day, n we might still be under the rule of British.(just an assumption)
As bad as it looks and feel, it has a bigger purpose and it happened for a reason.
PS. life is harsh, but doesn't mean we have to be.

The topic says, "does life have a purpose?" it can mean every individual's purpose or human races' purpose. It is up to your own interpretation, my statement just now was about Hitler's purpose in life.

I don't mind living by that purpose