the LED/shutter sound aren't about 'preventing it from happening', and your binary logic here is pretty lazy.
The point is that a red LED or shutter sound make it obvious to other people that photography is happening, in the most common cases. Someone who wants to surreptitiously photograph people without their permission will always do it, yes, but that doesn't mean the solution is to 'help resisting people transition into' being photographed without their permission in any and every scenario.
If the common case (i.e. stock Google Glass) has a 'recording' LED or shutter sound, it becomes much easier to address situations where a well-meaning person violates someone's privacy without thinking about it. This will lead to proper etiquette and understanding being formed. The alternative, 'I can take video of you without your knowledge, get over it, the FUTURE' perspective is not going to win anyone over anytime soon. Especially vulnerable minorities.
You misinterpret what he means by 'preventing it from happening' -- he is referencing the unnotified recording of another person by one wearing Glass. Adding a red LED will not prevent people recording without others aware as a red LED is something terribly easy to kill.
Nobody's goal here is to prevent recording without notification. It's impossible to prevent it, anyone who's used a digital camera since they were invented knows this. Stop misdirecting the conversation around Glass with moronic strawman arguments. The original article did not ask for a mechanism for preventing unnotified recording; it asked for a light to notify people you're recording them. This is a fundamentally different proposition that solves a different problem.
Whoa, relax. The original commenter's point was that you're adding in something that will give a false sense of security to others instead of trying to reorient the conversation towards having an always-on regards to other people and recording.
What does the red light solve, if not telling others that the glass-wearer is recording?
The point is that a red LED or shutter sound make it obvious to other people that photography is happening, in the most common cases. Someone who wants to surreptitiously photograph people without their permission will always do it, yes, but that doesn't mean the solution is to 'help resisting people transition into' being photographed without their permission in any and every scenario.
If the common case (i.e. stock Google Glass) has a 'recording' LED or shutter sound, it becomes much easier to address situations where a well-meaning person violates someone's privacy without thinking about it. This will lead to proper etiquette and understanding being formed. The alternative, 'I can take video of you without your knowledge, get over it, the FUTURE' perspective is not going to win anyone over anytime soon. Especially vulnerable minorities.