If for some reason you must write sci-fi/fantasy short stories, you should submit to the Writers of the Future contest. Great prizes, no entry fee, and you won't be competing against anyone who has already sold 2 or more stories. Write 4 stories per year and submit them to each quarter's contest. And stomp on a few cans while you write.
Hm, I would not be happy about that.
The people I met who ran the contest were scientologists, and they were very nice people. Hubbard put the money up for the contest as a payback for his early sci-fi career. I also wouldn't turn down a Nobel prize because Nobel invented dynamite and was an armaments manufacturer.
If you never do X, writing about it would be superficial, at best.