Well, here's hoping I will get an answer from the Big Guy :)
Nonetheless:
1. We don't see that though. What little I personally saw of Cornwall (and that was largely during his "challenge") gave me the impression that he actually cared about slaves. Granted, he cared in the way you would care about animals that are being abused, but it still seems better than considering them pieces of furniture. Half-elves having no rights sounds a lot like political sausagemaking to me: Cornwall proposed a sweeping bill, a lot of powerful people got upset that they were going to lose their toys, Cornwall scaled it down to exclude half-elves so that the bill could get through.
Cornwall DID NOT create the laws that caused Maria to lose her entire life. He DID NOT enslave Lin, he DID NOT turn Jin into a brainless sex addict, he DID NOT rape Nia until she turned into Elf Batman. He didn't even rape Sylvia in the middle of a fuck-a-ton challenge, FFS, if you want to paint him as an irredemable bad guy AT LEAST have him do SOMETHING bad.
At the absolute worst, from what we are shown, not told, he *might* be a greedy asshole whose motive in helping the elves was purely self-serving.
In other words, he's your average politician. Not even a particularly bad one.
The bottom line is: if Cornwall is to be treated like a villain, we need to see him do villainous things. Show, don't tell. I personally have not seen Cornwall act like a genuinely bad person, so it is jarring to me that the MC would use his connection to Trenero to get Cornwall's phone number just to YELL at him.
2. Laser tripwires, security cameras, volumetric sensors, bloody contact sensors! That stuff is cheap as dirt in a high-tech setting, and quickly goes beyond the ability of a single elf with barely the clothes on her back to defeat. Also, the software is being updated on a regular basis, so there is still some amount of work being done on them. Even if they were barely considered worth anything, they are still considered weapons. so a certain level of security is warranted.
3. He also seems to take certain things way too much in stride... Like Ashley pulling a knife on Maria. Or Ashley trying to kill Andy the Android. Or Ashley breaking into his room and then into his computer. Or Ashley threatening to kill him. Or... Ashley, really.
4. and 5. I don't buy it: even if it's just a single room that is generally used as a broom closet, just calling the cops and letting them deal with it seems far more realistic an approach. It's not like the half-elf in question knows they are a half elf, they went in for a genetic test of their own free will, how hard would it be to make them wait an extra fifteen minutes for the results while the cops arrive on site? Then the cops can take care of explaining the situation to the half-elf and their friends.
Even if half-elves are still considered furniture, they are furniture with a potentially influential prospective owner. The treatment of Maria at the hospital makes very little sense in context.
6. Kali. Lucia. Mariella. Three pretty good reasons for Trenero to help the MC, who is a potential son-in-law. This half-elf girl is a friend of his family, and the effort it would take him to help is pretty low: just make a couple of phone calls and see that *the procedure is smoothed over* so that Maria can be back at home before the evening is out. Even if the MC (and, don't forget, Kali and Lucia) were to ask for money, that's pocket change for him. You buy Nia with the money Kali spent on a DRESS.
But even then, let's say Trenero decides not to help the MC.
That is not the problem. If the author decides that Trenero is enough of an asshole not to help his daghters and potential son-in-law with a matter that costs him little to nothing, then that is the character of Trenero, and that is fine.
The problem is the MC not even trying. He's not trying to help Maria, he's just venting at people who have little to nothing to do with the entire mess.
The problem is that the MC is a self-conceited asshole who won't even go to the effort of ASKING two powerful people he personally knows to HELP HIS FRIEND WHO IS CURRENTLY BEING HELD CAPTIVE so that he can buy her before the day is over and at least help minimize *that* trauma.
He just yells at Trenero and threatens Cornwall.
I'm sure Cornwall is quaking in his boots. After he hurt the business of several rich, powerful, ruthless people with his elf-friendly laws, the idea of having an idealistic hotel manager with barely a buck to his name after him must keep Cornwall awake at night.
I don't like characters holding the idiot ball and not trying the obvious solution first. The solution doesn't have to WORK, it is FINE for Trenero to say he cannot help, it is FINE for Cornwall to say he cannot interfere with the proper procedures, it is FINE for the OTHER people who COULD potentially save Maria to turn out to be assholes.
It is not fine for the MC to be an asshole. Not and be praised for it, anyway.
P.S. Oy vey, typos away.