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Great video!
But I agree with Lumifer that ignoring bad ideas is not always the answer. Many bad ideas are kind of marginal and if you ignore them they'll wither. Others will catch on. Even if they die off eventually, they can cause a lot of damage before they do (the 20th century provides ample evidence of this, and the 21 is providing addition evidence).
Which ideas are you talking about? If you are talking about something like communism, it wasn't really ignored.