You're correct about no wolves being in Colorado seeing as how they were killed off in the 1930's (source) Colorado is part of their historical native habitat. For the Colorado DOW to keep them out of the state is not proper wildlife management.
Number of reported wildlife-vehicle incidents in Colorado per year alone? The average is 3500+ (source).
In the last 100 years, how many fatal attacks on humans have there been that were caused by wolves? Nowhere near as many (source).