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Half of Americans will tell you the solution is more guns. If the teacher had a gun she could have shot back. Not sure how that helps but OK.
The solution that no one wants to hear is a massive increase in the number of teachers and admins working at each school, as well as a large increase in the number of schools themselves, all of which will cost an enormous amount of money that taxpayers will need to foot the bill for. 
You can't maintain effective control of any situation where you're outnumbered 30-1, and as a result of those numbers being so badly skewed at every level (in the classroom, in the hallways, etc), violent behavior is allowed to fester. On top of that, you have to do so much goddamn paperwork to discipline any student at all due to how litigious our society is, so at a very pragmatic level taking any kind of action can be a massive drain on an already strapped resource (the teacher's time/energy). 
Cramming more workers into a situation isn't a guaranteed fix, but at a really basic level, you can't solve a 50-person problem with 5 people. >

The issue is capitalism.  It doesn't incentivize social needs that don't have enough return.  Education is investment, it doesn't turn a profit, it provides a return.  And it takes over 12 years to start seeing any of it.
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And in our capitalist system, the return is too long and too little to compete with other investments.  So private capital seeking return doesn't seek to educate, it seeks a quick return speculating or maybe innovation if it can get Uncle Sam to throw it enough bones to make it a sure thing.
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If we all seek to take more from a system than we provide, the system dies.  Another name for capitalism is parasitism. >

Til, American property taxes are capitalism.
Fund your schools! >

So according to this article, apparently there is little to no discipline for unacceptable/violent behavior.  Darn consequences from seemingly well-intentioned policies. >

Yeah but instead of addressing the issue which is that schools are punished for reporting accurate statistics, it seems to imply that zero tolerance policies were a good thing. They weren't and acting like they helped anything other than perception is simply false. This was a 6-year-old. They're clearly was other issues at play here. >

Zero tolerance is too strict, but there definitely should be more discipline than there is now in many districts. >

I absolutely agree as long as the disciplinary actions are actually effective. Often, we shoulder this responsibility on the school when it really isn't. We have a severe lack of mental health care funding in this country and ultimately that is the bigger problem. Also, if you break it down further all of these problems stem from poverty.