The argument is, these measures are 'necessary' because they can help 'prevent terrorism', eh? Hey, why stop there? Curfews and martial law will help even more. Biochip implants and a central tracking system will do wonders too. We're at 'War', right? Combine it with the War On Drugs and War On Crime. Maybe invent some new ones, like a War On Hate against nasty hateful racist people suggesting we scrutinize Middle Eastern immigrant airport workers a little more closely. Maybe we can find all the hateful, druggie, criminal terrorists at once, and start winning some of these mythical 'Wars'.
It's for 'the children', you know.
To hear the paranoids around here all of what you have listed is already being done. If you actually knew what a "police state" meant you would not be posting this nonsense.