Ugly and useless

It’s hard to see the point of Craneflies.
They appear in the late summer with their poorly attached legs and lazy indifference.
I mean, what good are they to the world?
But then again, what good am I to the world?
Nether of us would be missed in the great scheme of things.
Which leads me to ask - just what is this great scheme?
I feel we should be told!
Don’t bother telling the Craneflies though.
They couldn’t care less.