@nauticant
Tax law is notoriously difficult and does attract a tiny group of very clever people who can master it.
However, people who have that extremely narrow form of cleverness sometimes assume they must be brilliant at everything. Which ironically is its own form of stupidity.
The Germans have a word for this, of course: fachidiot
Noun. A derogatory term for a one-track specialist who is an expert in his field, but takes a blinkered approach to multi-faceted problems.
which certainly seems to apply to our Jo 
I too have a theory for why Jo is so interested, but getting deleted is not how I care to start my weekend, so I’m not going to share it.
To be honest, the more testerical he gets, the better, because if all you’ve got is bloviating outrage, and your case is so unformed it can immediately be switched from the one you said you were bringing, to challenging another one that’s already happened that you didn’t seem to have noticed was happening, then what you’re saying is you don’t know what you’re doing, and you haven’t got a case. Good.
What I’m not pleased about is him ratcheting up the emotion and making trans people feel they’re under attack. I never fail to be shocked by how cavalierly vulnerable people are treated by those who profess to be looking out for them.