You can find a more artistic and philosophical reason for murder, why make it so nondescript?
The unconvincing love line, the hero and heroine are not born murderers, but acquired psychopaths. The ideal template for a so-called natural born killer, look at Lars von Trier's "I Made This House".
In the end, just because the ending of a murderous couple flying away has made so many pretending traffickers orgasm? Crying about what love is better than a lifetime of lies? (I dare say you call Quentin over the script he wrote and he doesn't know what the bullshit means)
No beauty, disgusting, just those eight words.
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