Consumer organisations should force legislation to display CoO on every item we buy. That would start to focus the mind on the source of the world's problems.
I would agree, but more because shipping things back and forth around the world isn't environmentally sustainable, so I would like to see more distributed production.
CoO says essentially nothing about quality. Consumers demand low prices, and suppliers everywhere will engineer products to satisfy them. I will agree it is hard to identify quality products these days, as neither price nor CoO is much of an indicator, as witnessed by your Taiwan-made product that is apparently junk, but simply labelling CoO isn't a good proxy. Practically everything is assembled in China, from the dangerously low cost products to the most lauded-for-quality brands, it has nothing to do with nationality and everything to do with 'sort by price'.
Laptop PSUs are generally higher than 12V. For quality 12V supplies, look for monitor, network equipment or thin client power supplies from OEM vendors like Dell, HP, Juniper, and Cisco. Often manufactured by Delta or LiteOn.