Kids will be kids and parents must anticipate...
You are absolutely right, it is our job as parents to be one or two steps ahead, preventing any situation.
If there are weapons and the child takes it and ends up injured, it is our fault and not the child's.
Even with a fan without supervision they can end up hurt by sticking their little fingers.
A pot of boiling water a dish with hot soup can end in tragedy if we do not put it far from the reach of children.
I think that every day we try to do our best and for the love we have for them it must be so.
A hug to your children, By the way I am a fan of Oliver Queen.