Being nightmare for dev's

Most of the project management want us (testers) to be the nightmare for dev's (developers/programmers), but I do not agree with them. According to me it hamper the schedule of project. What we really need to do is to be the best friend for developers, may be they will not accept us our work intends to criticize their work. But we should intend to support them, as I learned Quality comes from dev's.