Wow, you really must be uneducated about the internet and restrictions people can put in place or a troll.
That part about the "supa hacka" is very entertaining. I'm sure they refer to themselves as that.
The only answers that you listed that's conceivable is C and D. I doubt mental illness would cause somebody to want to use a proxy. No clue wtf hovoccc is
Say person A lives with the complete asshole: person B (parent, roommate, etc). Person B owns a computer and pays for internet and decides to create a white list so person A can't surf for porn or something. By using a proxy, person A can get to web sites not included on the list (porn, manga, intentional malware downloading, etc.).
Most schools use a black list that they subscribe to some censoring company. They don't always block proxy IP list sites. Easy to bypass black lists. To bypass white lists, you'll need to get a working proxy beforehand. Good networkers will block access to certain internet options.
Another reason would if your government restricts internet access to a certain degree you can use a proxy to surf freely. That, however, could get one in serious trouble.
There are other reasons, but they're more complicated to explain and put in layman's terms and I'm not going to blow my buzz teaching Proxies 101
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