I would have to say that I would not in a fair chase, hunting situation.
On the other hand, I have been hunting and trapping hogs on private land for many, many years. I have gotten conditional use permits (nuisance permits) from the FWCC and shot up to a dozen in a night of hunting. (Not legal without a conditional use permit) I use bait, traps and dogs as well. So you see, it is a legal question for me. Not a ethical one. Now if the meat from the hogs I trapped or shot was left to waste, then yes, I feel that would be unethical behavior. As it is, I have a hanging rack, power meat saw and grinder, ample freezer space and give away tons of pork to friends and relatives. I am a meat hunter when it comes to hogs; not a sport hunter.
Now, when it comes to deer hunting, I am just the opposite. I hunt them on a private lease, with a 6 point or better rule and I personally use only a bow or a traditional muzzleloader.
Are both situations ethical for me? Yes! Maybe the gentleman you observed is a meat hunter. Hogs, although Game Animals on Florida WMA's are considered a pest by most landowners and most WMA regs are written to reduce hog populations to at least manageable numbers. Hence no limits as to size and numbers and special hunt opportunities on state lands just for hogs.
I wouldn't worry about it to much if I were you. If only one sow escaped from that hunter you saw, she will drop 2 to 3 litters by next season. Two years ago, I put a pregnant wild hog I trapped in a pen and she has raised 7 litters of 6 to 9 shoats. I can't give them away fast enough.