<h1>Because guns are crude!</h1>

In *Episode III: Revenge of the Sith* after defeating Grievous with a blaster, Obi Wan that blasters are 'So uncivilised'.

[Wookieepedia][1] explains that these weapons were:

> Designed **as much for elegance in combat as for ceremony**

If we look at the [origins of the lightsaber][2], they started out as forcesabers through which:

> Users [could] channel the dark side of the Force through black laboratory-grown crystals which would create the glowing energy blades

There is also a great symbolic and functional value attached with a lighsaber:

> The lightsaber was considered more a tool than a weapon. The
> lightsaber came to fulfill both a symbolic and pragmatic role for the
> Jedi; it identified the wielder, had a powerful visual impact, and
> given the availability of cybernetic replacement limbs might have been
> seen as a more 'clean' weapon than the blaster, which Obi-Wan regarded
> as "uncivilized," "clumsy" and "random."

([Source][3])


  [1]: http://starwars.wikia.com/wiki/Lightsaber
  [2]: http://starwars.wikia.com/wiki/Lightsaber#Origins
  [3]: http://starwars.wikia.com/wiki/Jedi