Remember, Jiminez is the drug dealer who used a chainsaw to murder Dexter’s mom, along with a couple of other people. Then he locked the bodies up in a cargo container with her young children, and left them all to bake in the sun until Harry found them, some time later.
This strikes me as someone who would find a cage to be a perfectly reasonable and necessary addition to any home, particularly a remote bunker in the Everglades. The cage is for keeping captives until they’re disposed of. Perhaps by feeding them to the wildlife. After all, you’ve got to keep the bait fresh, right? As it is, I got some dirty looks for shouting “Alligator! Alligator! All-Li-Ga-Tor!” when Dexter and Doakes were fighting on the dock. I was so disappointed when one didn’t show up.