According to a few sources the motive the prosecution will be going for is: "Drugs were not involved and Mercado was a wannabe hit man..."
...who simply decided to kill three people for thrills, unable to differentiate between reality and fantasy because of sleepless, week-long sessions of Grand Theft Auto and stale pizza, no other motivation or selection process required. The murdered could have been anybody. Maybe he would have killed me if I was unlucky enough to have met him and he knew when I got off work in the early morning hours.
Or, another scenario: he became aware of Ilona (how?) and developed a obsessive crush on her, but (a) only encountered her (much less contacted her) for the first time in this neurotic quest hours before she died and (b) decided her boyfriend had to die beforehand simply because he was her romantic partner--you know, a twisted revenge fantasy. Sal was just an unlucky sod who must be eternally regretting that the engine turned over in his dad's car that night, having left the ignition on for hours while he listened to 91X beforehand--but not enough to totally exhaust the battery. It was still good for one, final, startup.
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Respectfully, those dogs don't hunt.
There is a purposeful, non-random connection between this killer and his multiple victims that has nothing to do with mental illness (excluding sociopathy, perhaps)--but it has to do with
something that we can only speculate on at this point. Remember, these murders were planned and executed with enough finesse that the perp
got away and wasn't detected until he blew his own cover at the San Onofre checkpoint...perhaps dazed, dumbfounded, and overwhelmed with the realization that his secret was unraveling and it was much more likely that he would be caught. Someone who leaves their illegal instruments of death in the back seat while driving through a known security noose is
not the most experienced tool in the shed. We already know CM isn't a professional. My guess is that he is somebody else's messenger--and that "somebody" wanted to do this job on the cheap with a person they hope is loyal enough to not rat them out. (I'm sure the consequences of doing that are abundantly clear to CM. Rest assured, it's gonna hurt.)
Unless CM was involved in some direct manner with these three victims (and that isn't apparent in the evidence that we have so far), he probably was carrying out someone else's orders. He was skillful enough to pull the trigger, but he may not have had the cold, steely mindset that was polished enough to deal with the emotional aftermath of these murders. His unusual, bizarre demeanor (and his guns) exposed himself enough to be caught.
What was it about this man's appearance (and afterward, his behavior) that kept the border patrol from just waving him on through? It was obviously very suspicious--and very concerning--and far more revealing than he ever should have let on to a law enforcement officer to avoid standing out from the rest of the I-5 crowd.
Unfortunately for him, though, he couldn't help himself.
His greasy uncombed hair and sullen expression make him look sloppy and unkempt...CM doesn't seem willing to make an effort. Each court appearance he looks worse...there's no show of emotion...
He looks profoundly depressed and exhausted to me. It's not difficult to understand why he would be both. He may have some prescription meds on board that are blunting his reactions and making him sluggish as well. His dosage may not be well tuned up just yet.
Clinically depressed people don't give a damn what they look like. He may be sleeping all day but can't sleep at night. Just him and his thoughts. No hope of freedom, nothing to live for. No tough veneer to ride out the consequences.
This kid looks soft to me--just an opinion, of course. Maybe he did have a little fantasy of being a big shot for somebody else's bidding. Now his life is over, he knows it, and he has all the time in the world to think about it--including how delightful a lifetime in prison will be with only a little taste of incarceration under his belt.
The Twin Towers have crashed down upon this guy--not that anyone is weeping for him, necessarily.
If I was in his shoes, I would be just as disconnected from the world as he is.
I couldn't cope well having murdered three people followed by a lifetime of confinement either. He looks no better prepared for what he did than I would be.
He should have chosen his "profession" more wisely. He's not cut out for it. (Just look at all of the tracks he left behind for LE.)