“Nancy and Gavin probably did this.”
To what end?
No one is trying to pin it on right wingers. Every one is saying Antifa/blm did it, which are allies of Pelosi.
The only other justification I can think of for Pelosi to want to do that is her realization that antifa/blm are so radical that it’s starting to hurt her and the more mainstream Rats, and this may have been her way to marginalize them.
It’s a possibility...
But pampered, privileged Dems probably wouldn’t want to struggle with that head.