Meh. Lots wrong in our foreign policy with Mexico, but not this.
We did the same thing with Pakistan when raiding the eastern mountains of A-stan.
We do the same thing every time we fly over another country on a surgical air strike.
It's easy to point to government in general and find critique with every action. But supporting Mexico's legitimate government against the drug cartels in the North is laudable. I approve of the DEA's actions here. Not very different than collaborating with the Colombian government against FARC.
And I still excoriate the ATF for their actions in Gunwalker, and hope fervently for some semblance of Justice in the form of felony charges, including Treason.