Hacking at the Branches (John 15:18-27)

As the followup to "Life on the Vine," we now turn to the rest of John 15, where Jesus warns His disciples that there will be opposition to God's Vine Project. Many who are of the world will try to contain the Vine's spread by hacking at the branches. Why do they see the Vine as an invasive, unwanted plant? What is their strategy to deal with its presence in their backyard? And what role does the fruit play in how they perceive Christian influence?