How we became bitter political enemies

That negativity appears to have fed a growing perception that the opposing party isn’t just misguided, but dangerous. In 2016, Pew reported that 45 percent of Republicans and 41 percent of Democrats felt that the other party’s policies posed a threat to the nation.

The fear of what harm the other party could cause appears to be a major motivator behind party affiliation. “It’s at least as much what I don’t like about the other side as what I like about my own party,” said Jocelyn Kiley, associate director of research at the Pew Research Center.

When asked why they identified as Republican, 68 percent of respondents told Pew that a major factor was the harm that Democratic policies posed, just surpassing the 64 percent who cited the good that could come of their own party’s policies. Among Democrats, 62 percent said fear of Republican policies was a major factor for their affiliation, while 68 percent cited the good of their own party’s policies.