Making safe, in armed forces around the world, means making sure there is no ammo in the gun and the hammer is down.
The nearest equivalent device in civilian terms is the German cocking safety, where pushing it forward compresses the main springs and pulling it back relaxes the springs. Almost all other safeties block trigger movement, leaving the hammers cocked.
Any system that blocks the triggers but leaves the main springs compressed is not a safety. In that context the word "safe" on a gun is a bit of a fraud. With hammers cocked it definitely isn't "safe" no matter what the button says.
Some people, including some very experienced hunters, think that putting a gun on "safe" uncocks the hammers. Renowned man eating tiger hunter Corbett is one of these. He writes how on one of his hunts his gun was on safe, for he "never carried a cocked gun", the gun in question being a boxlock SXS rifle that automatically self cocks on opening.
