Ah, I understand what you're saying. But, unfortunately I think a lot of this has to do with publication and what the company you work for think is appropriate for the audience. Well, this is mainly for any author or artist who is working directly for a company. Anyway, they would look at your work and say "you can't do this, it's too serious, it promotes killing, not good for minors..change it, etc."
Although, what I just said really depends on the genre of the story. You'll rarely see a shounen character kill somebody for that reason, I would think.
To answer what fantasty cliches I hate...What is up with the all the cheat memory of the previous life to defeat the almighty evil?