A Civil Affair

The individual wants the truth as long as it is comfortable and safe, but if it is inconsequential or harmful he or she is apathetic or hostile towards it. An ideologue will examine other groups relative to his or her own particular group, especially with concern to ideas about language, behavior, customs, and religion.
Ingroup/outgroup identity is about essential identity. Because members of the ingroup are essentially good, the same behavior on the part of the ingroup is good, and the outgroup is evil. The essentially good nature of the ingroup is a "precommitment," meaning it is prior to and protected from discourse—no number of counterexamples will change the person's perception that the ingroup is good.
And it makes no difference if they are liberal or conservative. They believe their way of thinking is the truth because it is comfortable and safe, they fail to give any consideration to others views. Rather, they attack the other side because the ideology of their side is always defensible and must be defended to the end, even if they would (and/or have) engaged in the very same unreasonable behavior they are attacking the other group about. Civility is gone.