Hiroshi Mishima said:
In short, why the hell is Nintendo trying to curtail an aspect of the community (the homebrew scene) which likes the Wii and generally continues to support it, instead of going directly for the people who are pirating games.
Same reason they spent ridiculous amounts of time ripping sequence breaks out of the
Metroid Prime series, even though all that does is ruin their replay value for the most dedicated fans of the games. Indeed, the same reason Nintendo have managed at various times to annoy almost every major third-party developer in one way or another (Namco over screwing them with contracts from the NES / SNES days, Id for the emasculated
Wolfenstein on SNES, Midway for
Mortal Kombat, EA for not letting them manufacture cartridges when Sega did, Square for ignoring them over CDs, Sony for pointlessly double-crossing them over the SNES CD drive, Rare for massively screwing them over re:
Starfox Adventures and resisting
Conker's Bad Fur Day at every step, everyone who tried to develop anything for the N64 for stupid hardware bottlenecks, buggy devkits and Nintendo refusing to explain how the custom microcode actually worked, etc etc etc).
Put simply, it is because they are dicks.
The last two generations of Nintendo consoles used ridiculous proprietary media (3-inch DVDs and cartridges instead of CDs, respectively) so Nintendo could make sure everything had to go through them, so I don't see why it surprises everyone that their paranoia is in "business as usual" mode. And don't bring up the Video Game Crash, Nintendo's allowed so much WiiS2 shovelware that they're in no position to claim they're trying to preserve quality.