system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Why not snap your enemies' wands and/or break their arms?

I find it puzzling that - if they refrain from killing - the heroes do not effective immediately snap the wands of any Death Eaters (and other enemies) they manage to disarm. 

Why don't they also break their arms for good measure? Sure, wizards/witches can mend bones in a heartbeat, but that can mean the difference between life and death. If you break their wands and their arms, they are most likely not going to be able to retaliate.
gpt
Because it literally never occurs to them.

The heroes are taught how to fight in dueling class, where there are strict rules and the fight is over as soon as the opposing person drops his wand. This has pretty much taught Harry and his friends that they won as soon as they disarm the other person, so use that time to get away.