Seven reasons GM is headed to bankruptcy, Sharon Silke Carty, USA Today:

When GM realized how fast 1990s buyers were switching to trucks as personal transportation, it overreacted, pouring time and money into SUVs and pickups at the expense of car development. The result: As long ago as 2000, Wall Street was warning that GM could be overcommitted to trucks and wind up out of phase if the pendulum of buyer preference swung back to cars. Once consumer tastes began changing, the market was awash in new truck models, and profits were sapped by discounts needed to keep sales boiling.