Your opinion seems to be to trivialize how important this can be, which fine you do you, but I think saying it only protects "a few dissidents" is a bit ridiculous.
Every protest I've filmed at I hit the lock button 5 times so it forces a passcode. I feel secure knowing the police can't just take it and start scrolling - they need a warrant or they're bust.
You don't have to be a dissident to need your privacy.