The problem is that giving the capability, initially for "reasonable uses", also makes it available for unreasonable uses. That's the banality of evil - dystopias are built one "reasonable" step at a time.

For the conference case much more reasonable would be to make the organizer and anyone profiting from the even liable for having speakers without a proper work permit.

You can solve these things sufficiently without reaching for the panopticon. As more of our lives are moved to the digital world its very important that we don't give up rights that we previously had in interactions that weren't assisted by technology.