system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is fighting in hockey accepted but frowned upon in the NBA and NFL?
gpt
Mainly because of history. Fighting has been in hockey since it's inception. By the time people started questioning the practice, it had become so ingrained in the sport that people were opposed to removing it. 

For other sports like the NBA and the NFL, it was never allowed. So the decision to keep it banned is an easy one.