It doesn’t add up for me either, but on your first question: you can fight for justice and have empathy for people without a particular issue affecting you personally.
See LGBT allies for an easy example. It’s pretty normal to care about issues that aren’t yours, e.g. all the support Palestine is getting, even though most people supporting it have never been there and don’t know a single Palestinian.
A principled person usually cares about more than themselves.
But Brave is malware, so not a great trade-off