One approach that can be adopted on a personal level is simply changing the way one thinks. For example, switch from a binary (true/false) method of epistemology to trinary (true/false/unknown), defaulting to unknown, and consciously insist on a high level of certainty to reclassify an idea.

There's obviously more complexity than this, but I believe that if even a relatively small percentage of the population started thinking like this (particularly, influential people) it could make a very big difference.

Unfortunately, this seems to be extremely counter to human nature and desires - people seem seem compelled to form conclusions, even when it is not necessary ("Do people have ideas, or do ideas have people?").