Can you show a plausible use-case for such a thing?
A not-uncommon case in other DBs is to handle insert/update code where insert is the most likely result. Not sure if this is relevant to scripts:
Begin; ...do stuff... insert into.... <trap duplicate index error and do update instead> update... ...more stuff... commit;
Also, the blunder-on-regardless approach is popular in pg_dump, or so I'm told ;-).
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