provoked how exactly? if you make physical contact, even a light shove, you can't claim self defense, you're just going to talk people into throwing a punch when they know the laws aren't protecting them?
If we're living in your world where everyone is afraid of violence because the law won't protect them, sure it'll work. But people today will punch you if you insult their pride easily.
This kid purposefully let everyone know he was armed,
The article mentions the kid showed his knife to two teens on the bus, not the entire bus or the bully.
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