It's some kind of program designed to reply to random threads on message boards and post anti American garbage.
That's why the threads it's responding to have no commonality, and some are from so long ago. This whatever it is, program, is random.
That's also why it hasn't responded to anyone. The posts it's making are prewritten.
The US is a police state now. Americans should be out in the streets with pitchforks and torches, but instead they would rather shut up, cover their ears, and put their heads in the sand.
Weird.