Helmholtz Watson said:
Again, the kid went to far when he brought a weapon to school. If were talking about last ditch efforts, the kid should have dressed differently because when deciding whether or not to bring a weapon to school or moderate how you dress, the latter is obviously the more reasonable choice.
Saying that he should change himself to avoid bullies is NOT reasonable. First of all, you are assuming the bullying would stop - That's likely not to be the case, especially since they already knew he was gay. Here in Denmark, we have problems with anti-gay gangs luring gay men out on a supposed blind date and then beating them up. When bullying is related to things such as sexual orientation or similar, it's VERY unlikely to stop.
Secondly, the only ting that is reasonable is that the perpetrators get the punishment, not the victim. We shouldn't compromise with behavior like that EVER! Hell, the US went to war because they wouldn't compromise with terrorists. Why the hell should victims compromise with bullies? What's next, should rape victims compromise with rapists and "not have worn revealing clothes"?

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As for the whole "weapons" discussion, people seem to forget that we carry weapons on us at all times. They're called fists, and they are, in fact, more lethal thjan a civilian stun gun. "6 bullies" can be classified as a much more dangerous weapon than a non-lethal civilian stun-gun (not to mention the fact that finding an improvised weapon is also relatively easy) - and therefore using a non-lethal weapon as a response to a situation that is potentially very lethal is not inappropriate at all, especially since he didn't use it but only threatened to scare them away. He handled this by the book aka. very appropriately.