I thought it was pretty obvious. Sony cut a deal wtih Nintendo to make a PlayStation CD-ROM attachment for the SNES, but when Sony was about to announce it, Nintendo announced they were skipping Sony and going with Philips. Everybody at Sony was furious and they thought that Nintendo had publically humiliated them and were determined to do anything it could to destroy Nintendo. They spent 2 billion dollars bringing the PlayStation to market, all of Sony's management were dedicated to dominating Nintendo in the video game market and they did everything they could to generate hype. Nintendo made Sony "lose face" and they were determined to get back at them, no matter what the cost.