For the same reason Schumer jumped up in the middle of it and clapped then realized what a total fool he was. These people are all demented, it’s why they don’t notice each other’s dementia.
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Demented?
Perhaps, but I wonder if it’s a symptom, not a cause.
Sometimes I really wonder if all the wonderful millions of dollars these people make (with insider information) as well as their families make (with laundered bribes) is only the carrot part of the conspiracy (that you almost never hear about in the media), and that there is a stick side, including threatening of family members, and extreme psyops. These people are showing more than just PTSD. They have legitimate episodic ticks and outbursts that are downright bizarre.
I think they are just strange people to the core. If you watched the mannerisms of retiring justice Stephen Breyer you would think he's a 9th grade gay kid who just got the part in the HS play, just plain weird.