You cannot use traps for people to prevent trespassing. Like it or not, crossing the border is not a capital crime. Have you ever seen someone that has been entangled in razor wire? He either knows that or he is nuts, take your pick because there will never be a foot of that fence design built other than by US government mandate.
If it's visible and posted it's not a trap. Traps are intentionally hidden.
The guy who lost his farm was an ex felon to begin with.
He held some illegals and they arrested him on firearms charges. While he was in jail on firearms charges the illegals and the ACLU sued him when he could not defend himself, while he was in jail, and won the lawsuit and judgement.
That's not some innocent farmer, but that was not exactly harming illegals, either. Just some money hungry illegals and lawyers.