This story is a little ridiculous, not in what actually went on in the Congo (which is reprehensible) but in it's finger pointing at Sony. Kotaku has a good right up on just what's wrong with any finger pointing at any specific company at the time
http://kotaku.com/5028998/whats-all-this-playstation-wars-business
Technically you could also be blaming Sega, Nintendo, motorola, Samsung, toshiba, etc, etc ,etc. as they all manufactured massive amounts of consumer electronics, most of which use these types of capacitors.
I guess in the end though, there's only one group of people to blame...And it's these warlords in the Congo.