Firearms "should be locked up" sounds like a nanny state liberal mandate who has never set foot outside of an elitist bubble, and has never gotten their hands dirty. These are the sorts of people who think cops should have to leave their weapons at the station before they go home.
Oddly enough, many of the cops I know locked up their weapons at home so their kids couldn't accidentally hurt themselves or others; many on the federal side unloaded and locked their weapons in the building.
We can disagree, but my experience around firearms is that are a tool, not a toy; and need to be treated as such. Even when I had one at home I never kept a round chambered to avoid an accidental discharge. I've known people who accidentally killed themselves hunting because they walked around with a loaded weapon and it discharged, striking them.
So yah, storing weapons safely is a good idea in my book.