I don't know what your reasons against are, but a big one for me is an infringement on one's right to assemble. I know it doesn't sound like much, but for a lot of communities (especially ones that may already be "targets" for law enforcement at all levels [local, state, and federal]), surveillance may keep them from feeling safe protesting.
For example, imagine being undocumented and wanting to protest. You may second guess going to a protest (even if it benefits you to do so), because you learned law enforcement is tracking the communications and movements of protesters.
For example, imagine being undocumented and wanting to protest. You may second guess going to a protest (even if it benefits you to do so), because you learned law enforcement is tracking the communications and movements of protesters.