You've got a plane that's thousands of feet up in the air, going at hundreds of miles an hour, and you're trying to drop an object, a bomb, towards some stationary target in the face of all kinds of winds and cloud cover and all kinds of other impediments.
Imate avion koji je tisućama stopa visoko u zraku, koji ide stotinama milja na sat, i pokušavate baciti predmet, bombu, prema nekoj nepokretnoj meti dok vas sputavaju svakojaki vjetrovi i oblaci te svakakve druge vrste smetnji.