"it's not about funding government it's about population control"

BINGO!

That's the right answer. IMHO.

Why do you think they make you file taxes and spend a lot of time and effort doing this shit, every year?

It's not like they need that info. Try putting in the wrong info and you will see a nasty letter in the mail from the tax masters.

Dominance and subordination is established and yearly. They want to remind you that you are the slave.