Most everywhere else in the country your suggestion makes sense. In my county library funds are bundled in the county general ad valorem property tax.
Government officials want more money for random nonsense and corruption. Voters disapprove. Government officials pick something to hold hostage, such as the library. They propose a special library tax. Meanwhile, the random nonsense and corruption is getting funded.
The voters aren't that dumb. They know the library could be funded, and they don't wish to fund random nonsense and corruption.
It's a threat, "Give more money or we'll cut something you like!", when the voters can plainly see that funds are going to things that are improper.
Suppose the voters fund the library. Next year, when that funding gets diverted, the government will come asking for more. Maybe it will be a different thing needlessly on the chopping block.
I wish our local and state governments were as transparent as yours; sometimes they are, but it's not universal, and it's a sad disgrace that our country's (US's) governing bodies are so enthralled with secrecy in most public matters.
https://arstechnica.com/tech-policy/2017/03/public-records-a...
You see the signs on the schools, the fire stations, the roads, the police cars, and you think, "wow, my taxes sure are paying for lots of useful stuff!". You may be less enthusiastic about the solid gold hot tub, since it doesn't benefit you at all, but the system "corrects" for that automatically: since you don't use it, you never see the "paid with $20M of your taxes" sign that it, too, prominently displays.
Later some jerk runs for mayor with a bid to lower taxes by 20%, but thanks to the signs, he's easily defeated. Instead you vote Yes on Proposition Q, which raises taxes by 5%. The mayor buys a bigger solid gold tub.
Tell me you havent been around end of the year spend your budget parties / memos ?
"That police station cost $X million dollars" is too abstract for me to be able to understand without doing additional research. "You personally spent $X.00 funding libraries" is something that I can wrap my head around.