What generalization does the author make in the paragraph?

In 1995 federal agencies began a program to return the gray wolf to parts of its former range. They airlifted wolves from Canada into Yellowstone National Park. From there, the wolves had begun to reinhabit parts of Wyoming, Montana, and Idaho. But now everyone is pleased by the program's success. The ranchers in these states fear that wolves will destroy their livestock and have demanded an end to the program.