I'm a mathsy software developer, consequently logic is pretty important to me. Logic acts a vaccine against bad arguments and, as we're often exposed to ludicrous arguments, it's a pretty useful vaccine too.
For example we see these sorts of arguments when discussing climate change:
Some global warming is because of changes in the sun's output. The earth is warming. Therefore the warming is because of changes in the sun's outputor
Climate change can cause extreme weather events. There exists an extreme weather event. Therefore there is climate change.If we can't get discussions past these sorts of syllogistic fallacies then how are we to get on to the more subtle, interesting and important debates? The interesting questions are hidden when we muddle "some" and "all".
Until then Stanford is running an introductory logic course on the Coursera MOOC at the moment.