The most significant problem in political discourse is not that people embrace destructive beliefs after issues are rationally debated. It's that the potency of propaganda, by design, often precludes such debates from taking place. Consider how often one hears the claim that the US is committed to spreading democracy and opposing tyranny in the Middle East in light of this fact from a New York Review of Books article by Hugh Eakin reviewing three new books on Saudi Arabia (via As'ad AbuKhalil):
"The US does more trade -- overwhelmingly in oil and weapons -- with Saudi Arabia than any other country in the Middle East, including Israel, and depends on close Saudi cooperation in its counterterrorism efforts in Yemen."
Indeed, President Obama has repeatedly touted what he calls "the strong partnership between the United States and Saudi Arabia" and "the importance of our bilateral relationship" and often vows "to continue cooperating closely on a range of issues."
In other words, the single most repressive regime in that region is also America's closest ally. Eakin also notes that while Saudi leaders have exploited the rhetoric of the Arab Spring to undermine leaders it dislikes (primarily in Syria and Iran), its only direct action was to send its troops into Bahrain "to stave off a popular revolt and prop up the Bahraini monarchy" and use "its influence in the Gulf Cooperation Council, the alliance of autocratic Persian Gulf states, to pull together support for the beleaguered royal houses of Morocco and Jordan." About all of this Saudi bolstering of tyranny, Eakin says: "The White House has remained silent."
Actually, that's not quite accurate. The US has been there every step of the way with its close Saudi allies in strengthening these same tyrannies. As the Bahraini regime has systematically killed, tortured, and imprisoned its own citizens for the crime of demanding democracy, the Obama administration has repeatedly armed it and trumpeted the regime as "a vital US partner in defense initiatives" and "a Major Non-NATO Ally." The US continues to be a close partner of the Yemeni dictator ("elected" as the only candidate allowed on the ballot). And it stands as steadfastly as ever behind the Gulf State monarchies of Jordan, Kuwait and Qatar as, to varying degrees, they repress democratic movements and imprison dissidents.