Because we believe that somewhere in the nest of paradigms contained in the phrase "missional church" lies nothing less that the future viability of Western Christianity.
In order to develop a pioneering missional spirit, a capacity for genuine ecclesial innovation, let along engender daring discipleship, we are going to need the capacity to take a courageous stand when and where necessary.
Whether we like it or not, we are all on a journey, a Quest if you will, every day of our lives, and the path we must take is full of perils, and our destiny can never be predicted in advance.
Unless the church is equipping believers to embrace the values and vision of the kingdom of God and turn away from the materialism, consumerism, greed, and power of the present age, it not only abandons its biblical mandate, it is rendered missionally ineffective.
In short, apostolic movement involves a radical community of disciples, centered on the lordship of Jesus, empowered by the Spirit, built squarely on a fivefold ministry, organized around mission where everyone (not just professionals) is considered an empowered agent, and tends to be decentralized in organizational structure.
Interestingly, it's as though the gospel story of Jesus is the archetypal heroic journey, the embodiment of the very adventure that all people in every epoch have desired.
If we can embrace the adventure and risk and equip our churches to lay down their lives and abandon their inherent loss-aversion, who knows what innovation, what freshness, what new insights from the Spirit will emerge.
Most churches don't have the resources for these tricks and inducements but are still bound to the imagination that church happens on a Sunday in a building.