SCP
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Secure
The Foundation secures anomalies with the goal of preventing them from falling into the hands of civilian or rival agencies, through extensive observation and surveillance and by acting to intercept such anomalies at the earliest opportunity.
Contain
The Foundation contains anomalies with the goal of preventing their influence or effects from spreading, by either relocating, concealing, or dismantling such anomalies or by suppressing or preventing public dissemination of knowledge thereof.
Protect
The Foundation protects humanity from the effects of such anomalies as well as the anomalies themselves until such time that they are either fully understood or new theories of science can be devised based on their properties and behavior. The Foundation may also neutralize or destroy anomalies as an option of last resort, if they are determined to be too dangerous to be contained.
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"Safe" doesn't mean the object is harmless. It just means that it's been contained and it is controllable or thought to be controllable, or the conditions in which it does its thing are understood enough to be preventable and it won't act on its own. I.e. it will not fuck us over doing whatever it does unless someone actively messes with it or its containment system.
Your lever is perfectly safe provided no one touches it.
Unfortunately as Terry Pratchett correctly observed, if you installed a button in the deepest darkest cave and hung a sign on it that reads, "End of the world button, do not touch," the paint on the sign wouldn't even have time to dry.
yep
"A nuke is considered safe" was what made object classes make sense for me.