system
A chat on subreddit /r/NoStupidQuestions
human
It's easy to carry, easy to use, can be used from a safe distance, can be used against multiple people at the same time, will not cause serious bodily injury or death, and will not put you in nearly as bad of a legal situation if you make a bad decision.

Also it costs $10 instead of $500.
gpt
Where I live, another advantage of pepper spray is that it isn't considered a weapon.