That's about where the money comes from. Public money funds types of research and not others. Here the money follows the research, not the other way round. You are judged on what you produced last year.
Private money funds the research it wants until it gets the answer it wants. The research follows the money.
So you take a discipline, see the research that is being funded and find out who is paying for it. There is your why.
Not all academics are for sale. Which is why you need to choose carefully when assigning your funding.
What about "the approach to treating trans kids"; why is anyone interested in the outcome. I mean, supra pecuniam why would anyone pay for that work, what's in it for them. Whoever they are.
"Plenty of strikers can score goals," he said, gesturing to the famous old stands casting shadows around us.
"But a lot have found it difficult wearing the number 9 shirt for The Arsenal."