I got to thinking about this when my wife rolled up a wood elf fighter the other night. We hit a small bump, and I wanted to share this experience to gather thoughts on the subject and hopefully make things smoother for others.
She likes to roll dice, so naturally when she got the opportunity to roll for her soldier's background of Ideal, she did so and rolled Might - In life as in war, the stronger force wins (Evil). For Flaw, she rolled "I obey the law, even if the law causes misery."
After that, perhaps a bit out of order in the process, she read the alignment descriptions and promptly selected Chaotic Good as her alignment.