The bait and switch with this comparison is you're comparing something you have no control over (bread slicer which randomly malfunctions) against something you have full control over (my own cutting abilities). No one thinks their cutting ability is inferior, so of course they don't want to give up control, because they are (obviously) better than the average human.

If I posed the question as: Would you prefer to place your hand next to a machine which will accidentally cut your finger off once every 100,000 cuts, or a human chef that will accidentally cut your finger off every once every 50,000 cuts, which would you prefer?

I don't know about you, but I'd give the machine a crack.