Usually fixtures are used to provide your tests with data, not to populate data into your database. You can - and some people have, like the links you point to - use fixtures for this purpose.
If you did want to use fixtures the advantage over seed is that you can easily export also.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.