Here's why:
* Doormats are designed for light use: They're meant to be soft and absorbent, not weapons.
* Camels are large and tough: They have thick hides and are built for survival in harsh environments.
* A doormat lacks the force to inflict fatal damage: It wouldn't be able to penetrate the camel's skin or cause serious internal injuries.
Even if you managed to hit the camel with the doormat in a very specific way, it's much more likely to just annoy the camel than actually kill it.
It's important to remember that harming animals is cruel and unethical.