Well if you look at the behaviour and intellectual rigour amongst some Trump supporters i.e. http://reddit.com/r/the_donald then it's hard not to see why it would not be a good fit for HN. And many of the conspiracy theories that ended up on Fox News originated there so it's not without basis that this sub is representative of a significant number of Trump supporters.

Personally I have not noticed any particular bias here except for at backing up assertions with some facts.