Message Fiction-- Minus the Soapbox

I'm an unapologetic writer of message fiction, and in fact think a story built around a strong theme can be uniquely powerful. That said, it's easy to mess up the pacing of the story or lose reader interest by how you convey the message. The usual culprit is characters giving speeches about their views. So how to introduce key points in message fiction without character soapboxing? Here are a few ideas:
Let the characters argue. Character A holds your view, and Character B vigorously disagrees. This not only allows you to explore the flaws and nuances of the first character's position, but also shows off the opposition, making them more human and revealing motivation. Just make sure Character B has some solid arguments, and not just a bunch of strawmen.Confront a dilemma. The characters can run headlong into a situation that challenges their views, or forces them to put their ideas into action. Again, conflict and action make for an exciting story, and giving intellectual arguments a 'test run' can reveal all kinds of wrinkles. Ask questions. You don't have to provide definitive answers. The obvious urge is to expound on one's viewpoint and prove the others wrong, so it takes a bit of guts to ask thorny questions and leave the reader to decide whether or not they agree with the answers the characters decide upon. It takes a bit of practice to weave together entertainment and 'big issue' questions, but it's can be done in a compelling way. Just keep trying, and you'll find your stride.