Great site, and anonymous web browsing is a good idea if...
you are worried about your privacy for any reason.
You are worried about your safety (some people on the web have been known to make threats or stalk people or even in rare instances get violent).
You have something to hide (IE: you like to surf porno at work)
You have a shared computer and don't want the other people to know where you have been.
These, and I am sure there are others, are great reasons.
To use a proxy to access forums to harrass people anonymously, like Mr. Banana brain does, just shows what an asshole you are, and to what lengths you will go to impart your "assholiness" onto others.
So, in conclusion, yes the link is good, yes there are reasons to browse any and all websites using a proxy, and these reasons do not include harrassing, intimidating, spamming and other obnoxious behavior.
If you do these things, take a look at the jackass in the mirror.