I think I picked up on some of the issues:
- it might catch or prevent speeding
- it could stop terrorists
- it might catch people lying about running red lights
- it could confirm or deny alibis
I'm not too familiar with the US constitution, or bill of rights, but I don't think there is anything that says you are free to break the law.
Lastly, just put on a tinfoil hat and you'll be fine. It interferes with On* when they try to monitor your activities