I typed in a web address yesterday and got the message below. The message is coming from a crawl Google did. I'm wondering who put Google in charge of deeming which sites are a threat and which sites are not a threat? Are there guidelines they have to follow and what happens if they screw up? I keep thinking of a quote my Grandfather used to say to me when I was younger "Power corrupts, and absolute power corrupts absolutely".

This web page at www.example.com has been reported as an attack page and has been blocked based on your security preferences.

Attack pages try to install programs that steal private information, use your computer to attack others, or damage your system.

Some attack pages intentionally distribute harmful software, but many are compromised without the knowledge or permission of their owners