I can see scenarios where you have someone in your extended family/friends who constantly attempts to leech money off you because they know you have it. This is

I can see scenarios where you have someone in your extended family/friends who constantly attempts to leech money off you because they know you have it. This is something people who win the lottery often face which is why (in the UK) they can choose not to make their win public. More fundamentally, you pay taxes on your private deal with your employer but the government is just a third party involved in that transaction, the same as your bank. Neither the government nor your bank makes the amounts of tax you pay or what you earn public, them knowing doesn't really impact your privacy in any meaningful way. I don't quite understand how you've got from "well the government knows what you earn so everyone should!". I don't consider that something being a "societal good" automatically overrides peoples right to privacy, different people will consider different things to be private, many would consider that my personal medical data would be better off open to the public in fine detail as it would help medical research but this is generally not the case (in the UK at least) and neither should it be.