If you've never understood the idea of "privilege" before, your attitude of "oh what, this doesn't work for everyone else? It works for me!" is something that gets discussed a lot. Some examples of the many, many situations people can find themselves in where public salary disclosure would be a major problem:
- You have family members who have substance abuse issues. It's common for addicts to steal from family members who they rationalise can afford it.
- You're in an abusive relationship, and your spouse steals your money. Hiding part of your salary may help you feel independent enough to get out.
- Your kids' friends find out how much you earn, and bully them.
- All the rest of your family are part of a religious organisation that demands a tithe. You've lost your faith, but it would tear your family apart to leave.
- You have family who live in a country with a much, much lower standard of living. You support them financially, which is known in their community. Now their neighbours know _just how much_ you're worth, exposing your family to the possibility of kidnapping or extortion.
- Your name is Google-unique, and identifies you as part of a group that is stigmatised on the internet. If your identity leaks into your internet activities (e.g. via Google's real name policy), another major vector of harassment is exposed.
Just a couple of things off the top of my head.