Yeah, I agree that not every subject is worth arguing about. But if discussion is what you are after, then you need to know what you are talking about, or against. The nuclear program of Iran is a great example. You have done the research to know that those who are experts in the matter don't think Iran has a nuclear weapon program. The others are not prepared for the discussion.
(This certainty about Iran was actually news to me.)
The 2007 National Intelligence Estimate is where the Iran information originated, nothing has changed in the subsequent years.
'Mr Bush expresses anger that US intelligence agencies played a role in removing the option of military action against Iran over its nuclear programme.
He describes the "eye-popping declaration" in the 2007 National Intelligence Estimate (NIE) judging with "high confidence" that Iran had halted its nuclear weapons programme.'
Comparing the factual analysis to the propaganda whether on Iraq WMD before the invasion or Irans nuclear programme now is certainly an interesting exercise.
(This certainty about Iran was actually news to me.)