Why do the agencies not bother to filter out unrelated material? According to you, the responsible course of action would have to be to record only what is rela

Why do the agencies not bother to filter out unrelated material? According to you, the responsible course of action would have to be to record only what is related to illegal activity in the first place. Your talking about legality is a straw-man anyway: the point is mass surveillance being highly unethical. Not even the law reflecting that fact makes the reality of it only worse.