* Magical creatures have different weaknesses: The Harry Potter universe is filled with creatures with unique magical properties. While silver is a known weakness for some creatures like vampires and some mythical beings, it's not necessarily a universal solution.
* Werewolves are primarily magical creatures: Werewolves in Harry Potter are primarily magical creatures, not just humans with a curse. Their transformation and powers are driven by magic, making them more vulnerable to magical solutions than physical ones.
* Lupin's case: Remus Lupin, a werewolf, was a victim of a magical bite. While he suffered from the curse, his transformation was ultimately magical in nature. There's no mention of silver being effective against him.
* Focus on magical solutions: Harry Potter focuses on magical solutions for dealing with magical creatures. We see potions, charms, and other spells used to combat them. Silver bullets wouldn't be the typical magical approach.
However, it's possible that silver could have some effect, albeit not a lethal one:
* Symbolic significance: Silver might hold some symbolic power in the wizarding world, even if it isn't a direct physical weakness. It could potentially be used in charms or potions to weaken a werewolf.
* J.K. Rowling's ambiguity: J.K. Rowling hasn't definitively ruled out silver's effect on werewolves. The possibility remains open for interpretation.
Ultimately, the effectiveness of a silver bullet on werewolves in Harry Potter is left open to speculation. The focus on magical solutions and the lack of specific mention of silver as a weakness make it unlikely, but it's not entirely impossible.