On a recent (rerun) episode of CSI, part of the plot involved a homeowner who, tired of having his mailbox destroyed by teens playing mailbox baseball, installs a mailbox filled solid with concrete. The result is that the next vandal to strike the mailbox with a bat (from a moving car) suffers severe injuries to his arm and shoulder, and the driver of the car ends up crashing and killing both himself and the injured mailbox hitter.
On the show, the homeowner was charged with (IIRC) negligent homicide or something like that, but of course that’s a TV show. In the real world, what would/could the homeowner be charged with? I am aware that man traps that employ deadly force are illegal in the US, but what about a completely passive thing like a concrete-filled mailbox?
Add one more layer of ambiguity here: suppose that instead of filling the mailbox with concrete (which renders it useless for its original purpose and makes it obvious that it’s intended to foil vandals), the homeowner merely makes a super-strong, indestructible mailbox, with an I-beam post and a box made of 1/2" steel to render it impervious-to-damage-but-still-useful-as-a-mailbox. If a vandal injures himself while trying to destroy such a mailbox, can the homeowner somehow be held liable for criminal charges or civil damages?