Questions cannot be stupid, just answers

Did you ever think about this :

- Why, in order to shut down Windows, we have to click to "start" first ?

- Why is the lemon juice made of artificial ingredients, whereas detergent with the lemon aroma is made of genuine lemons ?

- Why is there no cat food with the taste of a mouse ?

- Why is the needle that is used for euthanasia - sterile ?

- Why do we wash the towels that we used after we took a bath, aren't we clean when we use them ?

- Why do kamikaze pilots wear helmets ?

- If I want to buy new boomerang, how am I going to get rid of the old one ?