I think you need to define the goal of "wildlife management" before you can answer your question. Generally, I suppose a definition could be "to use a variety of techniques to manipulate wild gamebird and/or mammal populations to hold their numbers at levels compatible with human interests and carrying capacity of the land". The negatives associated with wildlife management depend upon whose human interest is being served. Hunting is the primary tool for managing these populations. There are people who fear they'll be shot by someone hunting nearby. There are people who are disgusted by the sight of a dead deer strapped to the tailgate of a car. There are farmers who would just as soon see deer go extinct. There are birdwatchers who grieve at the loss of a woodduck. There are hunters who would like to see more game and have little concern for the farmers crops or suburbanite's shrubs. Maybe a good summary would be; "methods and objectives of wildlife managementcause conflicts between people with varying interests in the use and enjoyment of wildlife and the land on which it lives". Took awhile to get here, sorry.