Seems like alot of work to do this incogneto and succesfully. I mean, that's alot of acid to procure and dispose of. Also, a human body takes a good while to disolve in even strong acid, and might leave one hell of a stench to hide.
Gotta wonder how hard it would be to drive a body to the coast so a guy can motorboat out into the ocean a few miles, weight the body down with chain or something, and dump them a few hundred feet underwater? Much less infrastructure and everything. Not as intimidating as acid I guess.
Pardon my playing devil's advocate. This is horrifying, but at the same time I can't resist entertaining the question of how to dispose of a body as cleanly as possible.
I think it's mostly cultural. Mexicans make a big deal out of funerals. On top of that, if you dissolve some one, there is never any proof (no body of evidence, lol) that they are really dead. It's why the US military is so big at identifying the remains of POWs from our wars in Southeast Asia. It's not that anyone believes any of those POWs are still alive, but that it gives the families some closure.