Largely because the left is less interested in hating and killing everyone around them over irrelevant differences. There are many armed leftists, they just don’t cosplay government overthrow or post apocalyptic warlord on a regular basis.
Also, have you ever tried to organize anarchists?
I don’t know if all states have it, but Virginia does have vote history on their voter registration page. It doesn’t show what your vote was, but does show that it was received and counted.