Duties and taxes pay, either directly or indirectly for government services.
I have a car on order which is built in Thailand and to be delivered in Australia.
It is very popular and there are tens of thousands of them on back order.
Due to various shipping fcups there are thousands of vehicles from different manufacturers sitting in fields near the shipping terminals waiting for ships to become available.
Then in Australia there are the understaffed/overworked customs crews who find seeds from Thai plants in the chassis of the cars and the cars then need to be sanitised.
I am a farmer.
I understand the importance of doing this to protect our environment(Thai plants may not pose a problem in Olde Blighty).
TLDNR Taxes pay for services because multinationals and billionaires wont.