The Iran-Mexico assassination plot -- so what about the traffickers?

Everyone I read had the same reaction ...

... Plausible Culpability - By Daniel Byman | Foreign Policy

Incredulity has been the most common response to reports that Iran plotted with Mexican drug traffickers to kill the Saudi ambassador to the United States, Adel al-Jubeir, at a Washington, D.C. restaurant...

Now, six weeks later, the emerging consensus among my sources is that ...

• Iranian intelligence really is this stupid ...
• Mossad does dumb things too, so why not Iran ...
• Come to think of it, we're not that smart either ...

So it's being treated as "real". Lots of CIA operations going on against Iran, Saudi Arabia presumably friendlier now, etc, etc.

That's ok, but what about those Mexican drug traffickers? Didn't they just engage in a proverbial "act of war" against the US government? Does this mean they need to be watching for little dots moving in the night sky?

This really wasn't the smartest move for them.