It's just more power to use their software to make Americans safe, and miserable and paranoid. If you are red-flagged for any reason, this just makes it easier for them to abuse your privacy. Got to smoke out the bad guys, I reckon. Wait...
They don't they selectively target any individuals they deem as interesting and watch them. The FBI doesn't break into everyone's house, just anti-war activists and the like. It's worth noting that computers are expanding surveillance capability through data mining and advancements in the field of artificial intelligence could drastically increase the number of people that could be effectively monitored and profiled in the foreseeable future.
Look up "Fusion Centers". They're being put in place across the country by Dept. of Homeland Security to monitor whatever the hell they want. I know there is one in my city.
All a warrant does is force ppl/businesses to cooperate with police.. Police don't need a warrant if they get willing cooperation, and you can't fault them for that..