I believe that it is essential to note that Jesus does not tell His followers to divorce themselves from the world, but to instead spread His good news. In today's Gospel, He does not send the 72 off to cloister themselves to meditate and pray or even sing songs of praise. Instead, He sends them out into the world with specific guidelines about what to take with them (which is very little) and what they do when they arrive at various stops on their travels. They still take part in the world, but with Him as their focus.
He also does not send them alone. In this Jesus demonstrates the importance of working together, depending upon and helping one another. Our nourishment comes not just from our belief, but in actively working together to make the world a better place.