The reason for this pluralism is that countries differ in how many % a parties must at least get to have any seats. Most countries impose an artificial limit, called election threshold. Netherlands does not.
Mental issues roughly follow a hierarchical pattern, like cognitive abilities, like a general factor on top. At least, statistically.
The motivating factors behind this approach compared to the categorical (diagnostic) approach are: 1) evidence of continuity between clusters, 2) binary encoding of continuous data loses information, 3) correlations among diagnoses are the norm, 4) a given person may not quality for any particular diagnosis, yet have severe symptoms.
Some aspects of mental problems haven't been integrated into the hierarchical model yet. Say, unusual sexual interests (from foot fetishes to pedophilia and rape fetishes).
US Naval Academy: "a white applicant with a 5% chance of admission would have a 50% chance if evaluated as Black, and more than 70% of Black admits would not have been admitted under a race-neutral system"
Whites the most systematically discriminated against race.
The usual SAT gaps among applicants.
US military looks like other publicly funded institutions. A jobs program for non-Whites.
Americans are super fat, so many people look for explanations for this, usually something USA-specific like seed oils, or corn syrup.
Americans have some race differences too, but they aren't that large. The White Americans are quite fat by themselves, only Asians drag the mean down.
Maybe it's due to money. Americans are rich. Yes, but the plot worldwide looks like this. There's just about no relationship between median income (or GDPpc) after covering basic necessities.