If you think you have found that, you are kidding yourself. Powerful people have incentives to hire experienced and motivated professionals and the lawyers, guns, and money to do so. Odds are you wont be the smartest person in the room. Good luck.
Once you make enough trouble that using the library wifi might affect your risk, you've made enough trouble that it doesn't.
There might be more rewarding hobbies than discovering that the world works in the same fairly predictable ways it always has. If this is really your mission in life, you need bulldog lawyers not technology.
Hope is not a plan.
If you really want to set up a blog, why not just an email address under any name and a free Wordpress blog?
To be fair, he was kind of an idiot when it came to security. But there are ways of knowing who is using public wifi at different times.