You don't get it!
What is it with people in this thread. Everything is not black and White!
Nobody is saying that these locks are going to stop a determined or prepared thief, nor would anyone leave a laptop in a public area unattended, locked or not. That would be asking for trouble and stupid.
But... There is a place for these locks where a small deterrent like a lock which would involve tools or more than a passing swipe will generally save your investment. Like a client's office, or where the laptop is attended but the owner is looking elsewhere or looking at books, papers, talking to someone, on the phone, etc. A little like a woman leaving a handbag on the floor by them in a bar and talking, or a laptop bag, surly we have all seen or heard this happen.
I appreciate some communities are considered safe, but so many settings in this world are not.