Earlier quoted context omitted.
Murder for murder is the way that vendettas and feuds continue for decades, centuries, and even millenia. It's how one death turns into ten then a hundred then thousands then millions. That's not how civilized people should approach violence or warfare, even when violence may be justified. Look at the aftermath of WWII, for example, many of the most bitter enemies (such as the US and Japan) forged bonds of friendship…
So we should let Islamist terrorists continue launching missiles from schools?
Other than that, I'd like to echo the obvious [citation needed]. Which terrorists are launching missiles from what schools at whom? And did someone actually authorize a drone strike on a school in retaliation?
I should think that it's pretty clear that if you blow up a school, you're probably evil no matter your reasoning. I'm not saying there never has been or will be a case to blow up a school, but you'd better be pretty damn sure.