You're trying to disprove the political slogan, which is obviously rhetoric. "The only way to X is Y" is generally going to be false because absolutist statements in general are going to be false.

The real question is, for example, does prohibiting school staff from having firearms make it better or worse? Which is pretty hard to measure when there is a federal law against it. But a point in favor of "better" is that senseless mass shootings tend to happen disproportionately in schools and other places where the shooter knows nobody else is allowed to be armed.

> The real question is, for example, does prohibiting school staff from having firearms make it better or worse? Which is pretty hard to measure when there is a federal law against it.

Federal law forbids unauthorized individuals from possessing firearms at schools. All it requires is the state authorize it.

Result: https://www.cbsnews.com/news/texas-teachers-guns-at-school/

> According to the Texas Association of School Boards, "school districts can grant written permission for anyone, including designated employees, to carry firearms on campus" under Texas Penal Code 46.03, but the law does not lay out standards for training. The only thing a school employee needs in order to carry a firearm on campus is a license to carry, which requires a background check and a proficiency demonstration. Otherwise, individual districts determine the amount and type of additional requirements, which can include active-shooter training courses and psychological evaluations.

It's entirely legal to arm teachers under Federal law. (I don't think it's a good idea; I've met enough teachers.)

> It's entirely legal to arm teachers under Federal law.

Apparently it still requires the state to explicitly authorize it, and states allowing teachers to do this is a relatively recent development. So now we get to find out if it works, e.g. if school shootings in Texas go up or down relative to the trend in states that don't do this.

What federal law is that? I heard more than half of states allow it now.

> What federal law is that?

https://en.wikipedia.org/wiki/Gun-Free_School_Zones_Act_of_1...

"unauthorized" is in the first sentence for a reason.

States can (and do) authorize teachers to carry guns.

That's what I was thinking. States can and do authorize others, such as people with carry permits too. So it can be a lot of people, and it's my understanding this has been going on for decades in many states.

That last example is very weak, since the platitude explicitly mentions good guys with guns.

If there's not a single good guy in ~400 cops, that indicates a substantial related issue.

Indeed