I'm not dead set against the notion. You're making ridiculous hyperbolic statements like 'Batman isn't a martial artist' and 'shuriken are more deadly than a hail of bullets' and 'ninja definitely used shuriken, duh'.
The truth is more like 'Batman is a martial artist, and he uses other skills too' and 'shuriken are fairly dangerous little throwing knives that were primarily used as a distraction' and 'ninja probably used shuriken, although we can't prove it'.
I don't think it's flawed logic.
See, what you just said is reasonable logic, and I agree with it. The last list was absolutely laughable.