Be respectful, cautious and careful.
Absolutely. All that nonsense of setting traps, destroying property, vandalizing property, etc., is a lot of fun to fantasize about while we sit snickering behind our keyboards, but it just isn't legal. I'm not saying it shouldn't be.
But you can wind yourself up in much more trouble than they will ever be in if you harm them intentionally. Worse, if you catch them in a trap or cause them permanent bodily harm, you will be completely liable.
Imagine yourself explaining this to a judge an jury.
"So how did you handle the people you thought were trespassers?"
"Well sir, I shot the crap out of their truck, and then I called the warden when I heard them hollering from the pit trap they fell into."
"Did you have any proof that these folks were poachers before you shot their vehicle?"
"Well no, but had some problems from up the road a few times and I had seen this truck before so I thought it was poachers."
"Hmmmmm... are there many white FORD trucks in your city that look like this? Or are the suspected poachers the only ones with that type of truck"
You get the picture. You cannot destroy someone's property just because you want to. Personally, if I encountered a vehicle on my land I would have flattened at least two tires and called the game warden and the sheriff. With three flats, that car would have been trapped. Then vehicle registration could have established ownership, and that could start your poaching case going without legal cost to you.
And don't even think about the legal exposure of harming another person in a blind trap. You will be completely responsible for any damages if it is determined that your trap was set
only to catch human beings. There are mountains of laws on the books that try to define "reasonable response". Dropping someone in a pit for a day or two, hanging them up in a foot trap, or worse, a trap just to maim won't be viewed well in compared to "alleged" poaching.
As has been pointed out above, not matter how pissed off you get, make sure you use your head and don't get in trouble yourself.
Robert