There are 4 main types of truth. Subjective (aesthetic - "the beautiful"), intersubjective (morals and values - "the good"), objective (empirical / science - "the true"), and interobjective (function / systems theory). Most political discourse takes place in the value realm. Here people seek to get others to agree and resonate with each others worldviews. Unfortunatley, empirical data is often thrown to the wayside in order to score emotional points with people.
I just don't think websites like TownHall hold people to high standards.