Why do you use Tor when it's known that the police monitor exit nodes...

You are very much misinformed. Interpol and many international law enforcement agencies hire typical "computer forensics experts" and consultants to guide them on what data to collect from other organizations and to process all the data through database query tools.
With timestamped logs and computers running NTP, it is extremely easy to correlate entry and exit node traffic.

how about vuvuzela?

What is it?

Whos Von?

So if it doesn’t work how do people stay anonymous on the internet?

Check out panopticlick, run the test then click on "fingerprinting" in the results. Mine said my fingerprint is unique among the 200,000 tested in the last 45 days. And their data is obviously biased as they probably have more geeks running Linux / Mac than normies with Win10+Chrome.