What is the point of the sliding lock on an SD card if someone can easily unlock it?

Apart from the possiblity of encrypting documents on the memory car or using password protected documents, why is an SD card equipped with its own sliding lock?

What is the point of the sliding lock on an SD card if someone can easily unlock it?
It's so you don't overwrite by accident. If you know the pictures are important and you need to save them, you hit the lock. Then if you pick the wrong card you can't accidentally overwrite things.
Reply:it's so you don't accidentally erase the disk contents.
Reply:It's just a "write protect" lever, like on a floppy disk. It doesn't do anything for privacy, but it prevents the contents from being changed by mistake.