I'm surprised at the "it's only a clock" comments. Who knows how expensive the clock was (the OP doesn't say) but what if that clock had been bought by someone? What about the shop owner who now has to factor in that theft into his accounts. Oh, he's insured? Great, so his premiums go up so he's still out of pocket. And if we all steal clocks/other "it's only a..." stuff then what happens?
I don't think it's justifiable. So he was pissed? Does your moral compass evaporate when you are pissed? Mine doesn't, but if it does, drink less.
To illustrate my point here are some of the things that have been stolen/trashed that belong to me. Probably by pissed people. The replacement of/mending of all came from out of my pocket, but presumably that's okay because the people who stole it were pissed. It's only a clock, after all.... Yes, but it's MY/THEIR clock!
Car - keyed on both sides
Car - windscreen wiper bent
Car - aerial snapped off
Car - car 'badge' levered off bonnet with (presumably) a screwdriver
Christmas wreath - stolen from my front door in spite of being wired on
Olive tree in a pot - stolen from outside my front door. It was a wedding present. I've replaced it and chained it to the wall.
Bracelet - left on a changing room bench in a gym and gone back for two minutes later when realised my glaring error.
Baby blanket - taken from my babies' pram during a playgroup. Was inside the buggy snuggle and wasn't there when we got back. A newborn present and the one of the blankets my twins came home from hospital in.
Mont Blanc pen (present from my husband when I wrote my first article) - left on my desk at work when I went to a meeting....gone when I got back.
I could go on. None of these things look particularly significant. It's just an anonymous car/clock/blanket right? No, it's not. All these things meant something. And maybe that stolen clock meant something too.
Stealing sucks. And people who think it's okay suck too. It isn't okay. It's a shitty thing to do, pissed or sober. Unless you or your family are dying of hunger/in do-or-death dire straits (in which case you are welcome to the contents of my fridge/medicine cabinet) it's stealing. It's taking things from other people that don't belong to you. And however you justify it and dress it up and laugh about it, it's a shitty thing to do to people.
I hate stealing. Can you tell?