"The whole point of a proxy" isn't to spy on people, even if that's the only reason you use it. For instance, you could block lots of crap with the proxy, thus

"The whole point of a proxy" isn't to spy on people, even if that's the only reason you use it. For instance, you could block lots of crap with the proxy, thus increasing your organizations security. Does your need to spy on employees watching porn outweigh the potential benefit of not having to deal with porn viruses? You could also use the proxy to cache pages, so that your thousands of users don't waste bandwidth downloading the same pages over and over again. You can do this without harming your ability to spy on people.