I'm coming to the same conclusion. But then Scripture tells us to be prepared to "give an answer for the hope that lies within us." Perhaps this is because we can sew some seeds that the Spirit can cultivate.
I've come to the conclusion that a well phrased, well timed, comment is often more effective than a detailed speech outlining your whole argument for or against a topic. It's the little things that stick in someones mind, long after everything else is done and forgotten. The seemingly offhand comment is best.
The thing is, those kind of gems are hard to come up with, and most effectively come from the heart, with no prethought.
We will probably never know in this life whom we may have influenced.