Honestly, in the end, is there really that big of a difference between a shell blowing your head off and someone cutting it off in the end? Different methods, same result.
Beheading was actually tradition out there and in truth, it was accepted even in the western world of Europe (notably the guillotine) until over 100 years ago.
Hell firing squads were around til a few years ago and can probably still be used - its all just a form of execution.
The better question isn't why so - and - so is cruel, its why people in general are cruel.
You can talk all you want about Islamic fundies and whatever, but when you think about your own backyard and your own country: there have been a lot of pretty damn sadistic and fucked up people. Whitman or whatever his name was in the early 60s who took out people from the balcony of the tower in Texas - not to mention serial killers, kidnappers who torture their victims - hell, those guys who randomly chose a black guy and chained him and dragged him with the truck would probably easily be under the cruel and fucked-up category of acts.
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