Alistair, 

A moral dilemma for you, Alistair. A spaceship filled with genocidal aliens has visited my home. They were fairly friendly, but explained that it is their destiny to kill every human being in existence. They then demonstrated their ability to do so by using one of their ship’s impressive array of weapons to liquefy a cow. This particular shipload of aliens is merely the scouting party so they’ve gone off to establish communication with the mothership and let their leaders know that they found some humans to kill. Two important pieces of  information: 1. These aliens are tiny – they are less than an inch tall and their spaceship is the size of a big chicken. 2. They just parked their spaceship in my oven, mistaking it for a docking bay. Question: How morally reprehensible would it be for me to shut the oven door  and turn on the self-clean function? 

Thumb in the Dike in Barcelona 

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Thumb,

 Incredibly morally dubious, and also profoundly wasteful. Cook small aliens on 350 degrees Fahrenheit with basil and mint for two hours until crispy. 

Alistair