Xenomorphs are absolutely possible to kill, where are you getting the idea that they aren't?
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They're only killed in the movies because of Plot Induced Stupidity. Totally unrealistic.
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The movies ARE the canon. If they're possible to be killed in the movies, they're possible to be killed. Come on, Batman, I thought you were supposed to be better at reasoning than this.
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I-I-I'm sorry. I've been feelin' under the weather lately. My analytical skills aren't at their peak at the moment.
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It's okay Batman, even the best detectives in the silliest outfits have their off days.