Risk blindness - they are stainless steel clamps and could pull your eyelid of your face.
Mess with biology - they are applied upwards against the eye whose main mechanism, blinking, is a downwards movement.
Promote freakish and outdated ideas about female beauty - think Barbara Cartland, Diana Ross and Ruby Venezuela.
Are a con - aren't all women born with curved eyelashes anyway?
Yes, we think its time to bin 'em and say Ciao baby. Baby bye bye.