I thought the purpose was a terrorist tip line? So "a fellow citizen" that happens to be a terrorist should be left alone?
You're absolutely right. TIPS is asking nothing more of us than we have always been prepared to give. If any of us witnessed someone murdering someone, we would call the authorities; same principle is involved if we saw our neighbor building bombs. TIPS will be specifically for suspicion of terrorist activity is the only difference I see.
It's no different than my local news station giving descriptions of wanted criminals and asking anyone with any information to call in.