you're lieing or you're an idiot... i'm not sure which.
'Google has a financial incentive to keep your data secure'
Not since 9/11
http://www.theguardian.com/world/2013/jun/06/us-tech-giants-nsa-data
http://venturebeat.com/2013/07/11/microsoft-prism/
The only way I know of tracing somebody trough TOR is if you are sniffing the data both at the endpoint and at the victim at the same time, and matching the data that goes in to and comes out of the TOR loop. The other way you can expose yourself is if you share personal data on the Internet, as in post your name on a forum etc.
There was a loophole for uncloaking TOR in firefox, one can look up. They patched it, but one can also read about uncloaking TOR. There are hotshots who can. Basically TOR is a pain in the ass for people who are hunting pedophiles and bullies. In most cases it's probably not even worth the effort.