I disagree that multicopters are more likely than not to be used in a dangerous way
More likely than not, multicopter "operators"
don't even know, which action could result in dangerous situations, or which rules in general apply for airspace.
For guns, in most countries you need training and certification. For drivers licenses (i.e. using public roadspace) and pilot licenses (i.e. using public airspace), in all countries you need training and certification, even for model flying.
For multicopters you only need a few bucks and nothing more.
That's where the danger arises. It's all about knowledge and responsibility.
Tell multicopter buyers a few pages about airlaw, the possible situations "up there", the consquences that can occur based on their doings, let them sign a paper that they read this, register each buyer with the model-id and this signed letter, and they - most likely - will act more careful with their toys.
Until then, the risk rises with "drone"-sells
Thracian