you may think shoot first, ask qustions later. But if you really caught someone breaking into or stealing your rig, that they deserve to die? I mean seriously, in all likely-hood its some punk 16 year old that has no idea what he is doing and thinks he is untouchable. No one, has the right under any law to take that persons life for a stereo deck, I would agree 100% if that person went to jail for a long time (for killing) a car thief. Do you really want to KILL someone that was steeling a frieking driveshaft???
Shoot into the air, on the concrete, anywhere that will make the dumbass stop and be subdued long enough for you to call the cops. Trust me, getting shot at will change that persons live for ever, even more so if you hit them in the arm/leg/limb of some sort.
Now home invasion is a whole nother level, especially when you have a family, in that case the thief probably knows what he is getting himself into and I and the jury would support you 100%