They shot down a strawman because that's not the scenario being postulated.
"Ransom" and "ransom notes" have never been mentioned to my knowledge. Rather, this has been described as a "revenge abduction" and/or "revenge killing" as retribution for debt to the drug cartel and/or a human smuggling operation. The general consensus is that at the heart of this case is some other kind of illegal activity, probably human or drug smuggling. This was articulated by KNST News Director Paul Birmingham on Nancy's show, and at the time neither Nancy or any of her other guests said a word to argue against it. Hmmmmm...
Finally, numerous current and former LE have stated off the record that Sergio has a huge debt to the drug cartel and that that is at the heart of the case. Again, nothing about "ransom" or "ransom note" (presumably because they may already be broke), just revenge.
There's nothing more lame than shooting down a strawman; I hope they enjoyed it.