It's not about physical theft - there's intellectual property theft too, but I'm genuinely baffled over why anyone would get their knickers in a twist for being prevented from invading someone's privacy.
Plan ahead and fly somewhere else; problem solved.
It's Second Life - yours to do with as you see fit (provided you're not breaking the ToS).
Sour assumptions about why people won't let you invade their privacy seems a little childish, churlish and short-sighted. It's like saying you're a busybody with a desire to do exactly that - and hate being prevented from it.
I'm butt naked 95% of the time creating shapes; I neither need nor desire pervs coming in - or camming in - for an eye full of naked (and often very scary looking) pixels while I work.
I'm sure there's other creators with their own set of reasons for utilizing whatever security is at their disposal - not that they need to justify themselves to anyone in order to use the tools that are their right to use.
Point is that in most cases it has absolutely nothing to do with 'power' over anything or anyone but our own situation and our own privacy, with dozens of valid scenarios as to why.