One of the aspects I most enjoy about writing is creating believable yet strange worlds for my MCs to roam. When creating a culture, I like to throw in contradictions or idiosyncracies that add interest to the setting, just as it does with characters. Having the ability to manipulate a universe is one of the joys of writing Fantasy or Sci-Fi.
Creating many layers for a fictional culture is what helps bring it to life. History, religions, traditions and laws can shape a civilization just as effectively as the climate or terrain of the world. Laws and traditions can be a powerful influence, even when the meaning or reason behind them has been lost.
On Draxis, it's the universal religion of the planet that dictates all weapons must be primitive (in stark contrast to their advanced aerospace technologies, genetics and other sciences). Their traditions often clash with their scientific knowledge. Not unlike Earth, in that regard. ;)